Can anyone help me out?

A friend of mine is going through a bunch of hardships at the moment. She tells me often her family is screwed up. She hates her appearance, she hates her father and stepfather, and she hates basically everyone around her except for me because most have treated her wrong and she won't give anyone else the chance to get that close to her anymore. I try to be there for her as much as I can.

But it feels like it's in vain. It's... difficult sometimes. Because I know I can't heal anybody, and I realize I'm one person who cares amongst a million who don't, I get really overwhelmed whenever she talks to me about all the terrible things that happened in her day or week or what have you, because I am the only one she confides in. And I don't like that. She knows I do, too, because apparently everyone eventually gets sick of hearing her, for lack of a better term, complaints. I try to be as understanding as possible and normally, I'm a really caring person. But things have been getting worse for her and I don't know what the heck I can do. It seems the more time I spend listening to her, the more her life becomes destroyed. Am I doing something wrong? I genuinely don't know what to say or do or think to help.

Unless there isn't anything. So to anyone who sees this and can understand, what should I do? Or should I leave her to her own devices?

I don't wanna do the latter because it feels so wrong to just ignore or avoid her...