Is it possible your daughter may have what's called borderline personality disorder. Your daughter and many of the other stories sound like my daughter. I'm not going into details I've written so much about the problems she has given us over the years. After three marriages she actually went for help with depression, but was diagnosed with borderline personality disorder, or BPD as they say.Please, do yourself a favour and Google the condition, I think you might be very surprised, and it might explain a lot. All trust, and most of our love has gone. Unkindness, total lack of empathy, unless it suits them to be empathic, no understanding of anyone else's problems , it goes on and on. As my DR told us, it's not your fault in anyway. So please google, I'd be interested in what you think.