I Have A 34 Year Old Daughter Who Has Been

I have a 34 year old daughter who has been hospitalized for suicidal tendencies about five times in the last two years. She is manipulative and controlling, and likes to be in charge of everything, and doesn't like being told her behavior is unacceptable. Everyone else is wrong, and she is always right, and how dare anyone call her out on her behaviors. She has no issue with doing that to others though. I feel like she is missing a chip in this area, and I am concerned with pushing her over the edge of the cliff. Her dad and I have no contact, and really haven't since the late 1980's. She lives with him, and the two of them are in a very dysfunctional & co-dependent relationship. I don't know what my role needs to be here.. She has had some very negative behaviors for a long time, and I don't know what to be to her.