There isn't much you can do about it. If she isn't threatening you or the kids or breaking the law.... your SOL. I feel your pain, I wish I could take my son's sm to court for being a bitch and have her called on it and commited in an insane aslyum for all of the crap she pulls.... Most of the things these 'women' do SHOULD be against the law but it just doesn't work that way....
BUT....
Let me know if you figure something out!

I was finally able to have BM arrested after years of her crap for disorderly conduct(best thing is that she got cuffed for our wedding anniversary- sweet gift?) but that was because i had a cousin with me when she pulled her stunt this time and that made it taken seriously by the police since there was a witness although they still tried telling me to think about what i was doing to her and how it could effect SD, I simply told them what do you think SD is thinking seeing this all the time without consequences?, it kept them quiet while finishing the report. I don't know about the harrassment thing though, but record everything when around her I do it now, its a constant unbias witness that is undeniable. Hope this helped.

There is no reaon where logic does not exist

Lovers do not finally meet somewhere, they were with each other all along.

Of course we settled it in mediation, but she hasnt messed with me personally since. Sometimes, one time, is all it takes to make them wake up and see you are not messing around.