How to convince someone not to commit suicide?

[plato]

I need HELP quick. TO cut it short, I'll tell you that there is this girl which I know, who was been publicly ridiculed on Facebook, for her hair, by thousands of people on a viral Facebook page. She has been receiving death threats and this is not good. Despite the fact that she is only 14, she has got major depression and insomnia. She has been thinking about suicide for the past 2 years, and I fear this may be what triggers it. Not long ago she was abusing pills and ended up in hospital. Now she's broken up with her boyfriend, fallen out with her friends, and has just been depressed for the last two years, but now with thousands of people mocking her appearance, which she is particularly insecure about, she does not how to cope. Honestly, I do not know what to say, I am at lost.