Honey if she cares enoughto put her business on shout out, and takes the time to wear gloves and sanitize her hands,she is not gonna kill herslef. She is seeking attention any way she can get it!! Ignore her if possible, if not, dont stress yourself over her mental issues.
Whether or not she's "attention seeking" does not matter. If you want to help, look up a professional that can help her or maybe talk with her parents about getting her help. If she's attention seeking, she won't be upset about the attention it gets her and if she isn't just seeking attention then it'll be the first step to handling her issues.
If she refuses help she doesn't want to get well.
If she is suicidal who ought she be talking too? Don't take on her burden just direct her to someone who CAN help and has training to know if she's real or not. In the mean time be a good friend and do normal stuff.
Sounds like her parents did a number on her. She will drag down anyone she can with her. Good luck.