WTH should I do in this situation?

I’ll try to make this as short as possible:

I became good friends with a person on a gaming website and connected with her on Facebook as well. She is a trans person and doesn’t seem to have many true friends, because her self-esteem issues push everyone away.

She constantly posts whiny status updates about her lover that flip flop at an annoying speed, like: I hate him, I love him, I miss him, I hate him… She also posts lots of “I’m so unloved” statuses and pictures of her bathwater after she has cut herself.

I like this girl and feel really bad for her. I wish that she’d stop both the cutting, and all her other methods of self-destruction, but there doesn’t seem to be anything I can do to help her, and the frequency of her depressing posts are causing my own depression problems to get worse.

I want to remain friends with her, but my inability to shut off my empathy when it comes to her is turning this into an emotional burden.

I don’t know what to do here. Advice?