I think sometimes that my brother is also bipolar, or schizoaffective. He is in prison and I hope that he will seek help because he never has before. He uses drugs and alcohol when not incarcerated to control his moods or enhance them. Because it took me 2 years of failed treatments and bad reactions, he says in his letters that he's reluctant to talk to a psychiatrist or try meds.
It is hard to see a sibling suffer and not be able to get them the help they need. I guess all I can do is to write him about how well I'm doing vs. how bad things used to be. If your meds are still not working for you, though, how much harder to help someone else? Not saying that yours are or aren't. Just talking about my experience.
I hope she can get some professional help soon.

I'm sad with you about this situation.