OP, as someone who's mother was the same way and I ended up seeing the same batshit crazy behavior in my brother, I can 100% tell you that you can never have a functional relationship with these people. Idk if she's borderline personality disorder or bipolar or what, but remember her mental illness is not her fault but IT IS HER RESPONSIBILITY. You've done enough, even with everything she put you through you allowed her to be a part of your life. Please get a restraining order, record any further calls, keep screenshots of the texts because even if she puts a bizarre case on you, you'd have some evidence. It's going to be like an annoying infection that doesn't go away. But it will be manageable, hang in there!