hi.. thanks for writing..i can understand your concerns. personality disorder is most difficult to treat and they are very non compliant to treatment. among the all personality disorder BPD is difficult to treat.. the drugs are useful for the short term benefits only. they usually have mood fluctuations and emotional unstability. they are good at one time and bad at the other time even with the same person. in my opinion, if the behavior is not manageable at home then you shud consult a psychiatrist and get her admitted to psychiatric nursing home.she will show improvement when she ll start taking medications properly. there are drugs which can help her in controlling her mood.. there is a role of psychotherapy in BPD, particularly DBT [dialectical behavior therapy]. you shud also consult a psychologist or counselor who is practicing it.. the behavior of patient with BPD is really unmanageable, because they themselves do not know what they want? i hope this will be helpful to you..best of luck..