Vent - update
So, the "modesty" issue came to a head, DH is taking away all SD's skirts, because she was body shaming other women for not being modest. He was deeply disturbed, I think her possible borderline issues, along with her constant rude behavior and lack of friends has caused him to hit rock bottom with her. He told me he is very ashamed about the way he's behaved in the past and he had apologized to me over and over again this past weekend. We decided that she can earn her skirts back. We figure when she starts acting like a Christian (not the judgy, holier than thou, or preachy kind) she can start dressing like one. Hopefully this means SD will get some help, and I feel on the verge of crying I'm so thankful. I don't like her as a person, I don't like having her around, but I do care about her. I spent today reading tons on boundaries, mostly because confronting DH about SD always stresses me out, and I told him I'm planning on staying completely disengaged until I see evidence that she has changed. So no camping trip for her regardless. As much as I think she needs to be in nature, I need to keep my space.
I also wanted to share an article, I thought it was pretty eye opening, and it helped us make the decision to take the skirts away. I'm not LDS but this woman is, and she shared an awesome article about the dangers of "modesty" https://ldsmag.com/the-problem-with-overemphasizing-modesty/