Well I would say one thing is she probably needs to get away from her mentally abusive family for one. Perhaps she could get some help with that though getting professional therapy or something...there are some places with sliding scale fees based on income.

Also just something I might point out, all the anti-deprssants in the world aren't going to help if she's stuck with invalidating people like that. I wish I had better advice as to how to go about helping her improve that situation. I think if someone in my family told me the wish I would just kill myself I'd be going to the ER to be admitted to the psych ward so I don't do just that....I guess i just don't see how healing would take place if one is still in the same damaging situation.

But at least you are there for her, it probably helps her having someone who cares, understands and doesn't invalidate how she feels.