Question about psychology and also philosophy of life?

[socrates]

My gf says she hates herself and has since she has been able to use introspection... like since she was 8... I'm really in love with her, and I'm only 17 so I want to help... Before you say anything about our ages, (shes 16 and a half btw) I think that nowadays we see a lot of people marrying or becoming very close to it very early and a lot of sluts and whores because we live in a crazy mixed up world, so naturally some people cling to those who arent crazy and mixed up and some well... you know...
So anyways, she says that shes hurt herself too much psychologically to recover, shes cut herself, a lot.. and more, and even though this is anonymous and Im going to delete it I wont say certain things that happened to her.... Suffice to say she was used by her ex the only other guy she was ever with because she had no self esteem and didnt realize it...
We actually met originally in tae kwon do in 7th grade and I always knew it.. her self esteem issues, she was good at TKD but wouldnt try
she hadnt cut herself since she re-met me in mid september of 07 but did again recently... She thinks that she is worthless and says it will never be better and that she could easily kill herself and the only thing stopping her is all the people that would be hurt by it.. mostly me at this point....
My philosophy is that this is weak... Not only is it giving up, it doesnt change anything because she would only move on to a different dimension/heaven/whatever you wanna call it and she would still be herself.. she has to learn to embrace herself... But she has depression and I can imagine why that wouldnt be easy... Please what should I do, I love her so much... she thinks she has schizophrenia too.. I've always been the one of my friends that is the philosopher, who can motivate and turn them around, I think I made some progress with her, but Im kinda lost at this point, you can place a truth at a persons feet but them must embrace it for themselves right? I figured Id get closer
and closer to her and then try to help her once we trusted eachother, but I just dont know anymore..
So how do you cope?