Borderline Personality Disorder

My fifteen-year-old daughter was just diagnosed with BPD. She's been having problems since early last fall, but has gotten worse. They first diagnosed her with anxiety and depression, then later thought it was Premenstrual Dysphoric Disorder (PMDD). She has been under a doctors' care and counseling since her problems started. It's nice that they seem to have figured out exactly what it is. Her psychiatrist, GP, and a doctor at the hospital she is currently at all came to the same conclusion, which is reassuring.

Does anyone have any advice or websites they could recommend?

Thank!