What should I do my best friend is possibly suicidal?

[maron]

Ok so my best friend is possibly suicidal a few days ago I found her yahoo answers account and she is severely depressed and suicidal but she told me that if I ever found her yahoo she would just kill herself at that time I thought she was perfectly fine but I now know she isn't so what do I do I can't get her help or she'll know what I did and she'll hate me. She doesn't need me she has so many friends and I don't know what to do she even knows this one girl on Facebook and they are both mentally unstable but I only know that because she left her Facebook open on my phone and the conversation was right there so what do I do I don't want her to hate me. Please help. Also excuse my horrible grammar and punctuation I'm just really worried about her. We are both 14 by the way. XX maron