I did; but neither she nor I has any mental problems. I kept pushing away my parents for almost two years. Dumbest mistake of my life. Your situation is totally different, however so I can't really advise what to do, other than if you don't live at home, do the following:
1. Turn of the cell phone/ignore her calls.
2. Don't respond on AIM or to e-mail.
3. Avoid contact in any situation.
4. Don't write letters or respond to them.
That's what I did. Again, I feel I was incredibly stupid for doing so, but it worked.