It's ok. I would just unfriend her. I had a friend like this (a best friend/ mutual cry buddy) and after a lot of anguish and mixed signals, I unfriended her, and then she was like "what's up," and then we became friends again, and then she unfriended me, and I was like "hey now" and after going through the cycle a couple of times I realized it wasn't meant to be, and was literally nothing personal. I know that it's hard to believe when people say it isn't personal, but some kind of thing is going on within this person. You can't guess what it is, it's not your fault, and it sucks, but it's really not about you. The sooner you can get back a sense of personal control over this situation, the better it's going to feel, especially if you work together. I'm sorry about it. Friendships between people who are drawn together by "issues" seem to be like this, very supportive when they work out, then when they stop working, it is almost impossible to put them back together.