Honestly when I was married & couldn't stand being trapped in the marriage, I meant the suicide attempts I made & I never told anyone about them. I wasn't using it as blackmail....I was really attempting to get out because I felt that it was my only way to get free from being trapped.

You are definitely being manipulated by her just as the others have said....you are better out of this mess. Her life is her issue.....but I would also confront her about the fact that you will not TOLERATE being manipulated by her & that is exactly what she is doing.