Hi Paris56,
But having said that no one wants to send her somewhere that won't focus on the mood issues.
Dr Robert O. Friedel, had a sister, her name was Denise and while she was growing up through adulthood, she was never treated for BPD, they didn't know how to treat it back then. Dr Robert O. Friedel developed effective treatment for BPD, in his book BPD Demystified he says that they want to treat the depression first because it can lessen the BPD symptoms, it's easier to treat the disorder if depression is under control.
Borderline Personality Disorder Demystified