I'm worried about a friend?

me and my friend are 14 and we've been friends for a few of months. I always knew she had some problems but after getting to know her personally I am seriously worried. She has a really rough home life (parents went through nasty divorce, hates family, lots of big fights, etc) She knew someone at our school who recently committed suicide. I've heard that she had a past of cutting herself. She lies a lot and comes up with these crazy stories, many of them violent. I'm guessing she does this for attention. She is pretty violent herself (always talking about how she wants to punch all these people in the face) I've looked up suicidal warnings and it says giving things away, and I recently noticed that she's been subtly doing this, nothing big, just like little things (ex: cheap ring, shoelaces) She loses her temper over every little thing with her mom. I haven't really paid enough attention to be sure, but she's very skinny and hardly ever eats at lunch. I'm not sure if maybe she's just seeking attention or if I really need to be concerned and find her some help. And if so what help? I'm just really worried and need some advice.