Whats wrong with my daughter? Has she got a mental illness?

You have had ENOUGH of your own daughter? I am sorry to break the news to you, but her problems might have to do with your parenting style. :-( Poor kid. You are supposed to be her rock, not her judge and jury. My daughter has friends with the same problems, and she is the one who ends up taking a parenting role with them. It's your job. Take responsibility for your mistakes and shortcomings, and learn to have a better relationship with her.