I consider people who make false accusations to be despicable. What's in it for them? Do they want more time with their kiddos or more money? I think I'd be going after them for defamation ...

What does the visitation schedule look like?

First and foremost, it shouldn't be YOU that leaves YOUR house. Your FH needs to find some place to have visitation with SD. I know that seems very unfair to him, but this is HIS problem with HIS ex and HIS daughter. If she is going to make false allegations against him, he needs to see hia daughter in public places and/or with others present for his own protection. Does he have any family who would be willing to let them stay with them on his weekends with her?

Secondly, hire your own attorney to protect you and your daughter. Yes, it will be expensive, but it will also be expensive for BM to have two attorneys attacking her/her attorney. You having someone that won't just let BM say and do what she wants without having to answer for it may get her to back way off going forward.

Third and final, consider living apart or having two residences with your FH. On his weekends with SD, he goes and is her dad solely. The rest of the time, he can be with you. If that is not a life you want, you'll have to reconsider this relationship. But it will be the safest unless/until your FH drops the rope and ends visitation with her.

Need to vacate your home to accommodate sd's visit? Why is your husband not holding this visit in a hotel or his parents house for the weekend?

kicking you out of the home and assumedly your minor daughter further fuels this bullshit nonsense. 
 

if any of my sd's pulled this crap and i was ordered to not be in presence of sd's, visits would be held outside the home
 

at most al court should state is you cannot be there at visits. Hubby is free to hold visits at another address temporarily. By kicking you out, your home is no longer your sanctuary

It is definitely a struggle, and as time goes on and skids get older, the struggle gets harder.

1. YOU do not leave your home with your daughter, your FH can have visitations somewhere else. I do not understand why you have to go anywhere.

2. Trust me - the accusations get worse over time, not better. HCBM will up the ante, and you can potentially lose custody visitation of your child. Weighing the risk/reward, is this the relationship for you?

I have seen this before. I have been the recpient of accusations. Unfounded accusations. I dont feel comfortable being alone in the house with SD16 backstabber/munchkin. I am no contact with SD23 Feral Forger. Its been a long 8 years...

 Ultimately your job is to protect your child and yourself, that might mean ending the relationship or holding off on marrying your SO until SD is 18.  At this point living separately might be the best option for you and your child.  It’s not ideal but if you and SO really want to be together this might be the best way.  I would also advise your SO to get nanny cams to cover every inch of his home so that when BM escalates her accusations your DH has his bases covered.  You might want to consider filing a restraining order against his BM as you don’t know what lengths she will go to.  There was another poster on here whose SO’s baby mama actually called her work and tried to get her fired and also accused her of abusing the stepchild. 

BM has accused DH, myself, and other family members of a variety of things over the years. BM accused my BIL of sexual misconduct, not seeking criminal charges or anything, just wanting a clause added to the CO that SS would never have contact with him. Guess what, she got that. BIL has never met SS10 and BM only did it because she knew it would hurt DH. The only time BIL and SS were in the same room together was our wedding, which BM demanded to attend to supervise SS. Well, BM attended our wedding, sat in the corner like a loner, and 8 months later during our custody battle, accused BIL of luring SS into a bathroom at our wedding. Our attorney had a field day pointing out that if BM was there to supervise SS, what did that say about her ability to parent and protect him? Needless to say, all allegations from that instance were dropped. 

Our attorney advised us that BM would likely start making false allegations when we took her to court. He recommended buying security cameras and having them present and recording whenever SS was with us. We put one in each of the main living areas - kitchen, living room, dining room, and one outside of SS' bedroom door (to record who came in and out). You can't record in a bedroom due to privacy laws. BM didn't know about them and SS asked about them once. We deflected, telling him it was to keep an eye on the pets when we weren't home. It was a lifesaver. BM later accused DH of physical abuse, but because she had testified in court that DH was not abusive, it was dismissed. Plus, we had video evidence, documenting every second of SS' visitation, so it was hard to argue with that. Once BM found out we had been recording visitation, there were no more allegations. I highly recommend cameras if these allegations are dismissed and visitations resume. Until then, I would make DH have all visitation outside of the home. You and your daughter deserve some stability despite this mess. 

I did have the conversation with DH, that if BM continued to pursue this crazy vendetta against us, he would have to choose between our family or seeing SS (since we only see SS 6 weeks per year on a long distance schedule). It wasn't really feasible to do out of home visitation due to our schedule. It never came to that point but DH was ready to stop all visitation if the allegations continued. 

Lots of good advice already about prioritizing the safety of your daughter. Regarding the pending court date concerning BM's accusations against you, try posponing it until AFTER your fiance's attorney has received the therapist's notes so you can use them as leverage in your own case. Hire your own SHARK attorney to lay out the ugly truth of BM's alienation campaign, request legal fees, and an order of protection.Then your fiance uses your case (if the outcome is favorable, that P.O. will be valuable) AND the notes as leverage to regain as much lost ground as possible. He should ask for legal fees (if applicable in RI), lost visitation time, and counseling be ordered to help repair his relationship with SD. Two separate court cases, both requesting damages, may shut down the harpy for a while.

You need understand that with HCBMs, they fight dirty - dirtier than you've ever imagined -  and continue to escalate until the other parent either gives up or drops so much napalm on them they learn that screwing with their ex = PAIN. My DH's eldest daughter is a narc and a HCBM who thought she was going to dictate terms when her first H divorced her. Well, he scorched the earth around her so badly with attorneys paid by his wealthy family that she never tried to mess with custody or c.s. again.

IF you stay with this man, you'll need to take every precaution to protect yourself and your daughter for the next decade. You'll be up against TWO BMs working in concert, wishing you harm, and BOTH SDs will likely be weaponized. You'll never know peace. Is that what you want for your child? 

You end their ability to do that.

sd is making false allegations against you means she has no contact or presence with you in your home ever or any meets in public together. You do not be anywhere in their presence. You do not vacate otherwise hubby is signalling that he agrees you did abuse her.

what message is he sending about your relationship? Its that you're so not in this together, that you are not a priority and he definitely does not have your back

when i saw the warning signs of sd's hubby refuted them, said i was imagining things that they loved us which is impossible when they referred to me and our 2 kids together who were 1 & 2 as the new family like hubby had abandoned them.
 

Didn't take long, within a few meets were the cheoa digs and criticisms to put us down, then miniwive behaviour, followed by them thinking they had authority over me and my 2 kids with hubby.

Barely 1 yr into us first meeting sd's did the eldest sd now 24 call hubby with fake cries on the phone claiming he abandoned them to marry me and have 2 kids with me to replace them. That was so far from the truth when sd's knowingly believed bio mums lies about their dad and me, admitting they knew it was lies, excused and justify the lies mum made about us saying she was bitter and traumatised about the divorce

that was total bullshit when she was openly having an affair with her ex highschool sweetheart who was married and married him the week after divorce was finalised. She doesn't get to claim she's bitter and traumatised when she had been married already 5 yrs and bragged to people how in demand she was and could get a bloke stat. 
 

sd's made a decision to end contact with dad because its part of the narc high conflict manipulative playbook and hope daddy will jump through hoops for you. They didn't contemplate daddy would meet someone and realise how toxic and unhealthy their shenanigans were

the moment hubby told me the sd's were scapegoating me and our 1 & 2 year olds as the reason why they don't have a relationship with daddy when they cut off contact 5.5 yrs prior and i only met hubby 4 yrs prior to that was when i refused any meets in public with them, any holidays were to be sd free.

ss isn't as under control by biomum as she abandoned him and he was under my husband's custody so he despises his mother.

when i cut off the contact, bio mum and stepdaughters have no power anymore to control my marriage or cause more issues and they have no more ammo but in order to do that, you need to have trust in your spouse that they have your back so any meets your spouse has with his feral kids and they spew more lies, he has your back 100%
 

its hard for op to feel that way because her partner openly supports kicking his fiancé out of the house over lies, he doesn't have the balls to address this and say i refuse to have my daughter in my home until she apologises and puts in writing the lies she made.

sd needs to understand actions have consequences and so to inaction has consequences too

you aren't even married yet and things are thhis bad already. They won't get better.

i foresee closer to the wedding the typical narc playbook of sd's telling daddy it me or her(you) and he has to choose between marrying you and losing a relationship with sd's or he picks them and ditches you. The latter option is one where they never end up being happy and live miserable lives