My best friend is suicidal and i dont know what to do please help!?

my best friend is really depressed right now. shes DEFINITELY not herself and shes been slitting her wrists and keeps showing me this video.. http://www.youtube.com/watch?v=C2ywDnk7rNs and now saying shes going to end her life. all of this is because she broke up with her boyfriend a couple of months because she had an abortion because he didnt want a baby.. but she never told him (or me.. her bestfriend) about this until today! her ex boyfriend is now with someone else and this is what has made her like this.. the only thing she wants is him.. she wanted to be with him for the rest of her life and she says shes lost her baby and the love of her life! shes 15 years old and i keep telling her she has her whole life ahead of her and so many people need her and that she can get through this and i can help her and stuff but shes so stubborn! i dont know what to do please help :'(