Should I try to repait this friendship?

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I had a very close friend. We have known us since 1st grade (I was 6 years old). Now I'm 19, and this jear we finished high school. In school, we sat together for 4 years ans we were inseparable. But now, my best friend isn't just whoe she used to be. I don't know what happend, but one day she just stopped talking to me. Sure, we did talk about school and such regular things, but it just wasn't the true friendship. Few weeks later I called her to ask her if she wants to go out with me and the rest of usual crew, but she said she planed on staying home that night. That same night I saw her with other people in a bar. Since than she doesn't care about me anymore. I tried to speak to her, asked if I did something wrong, but she kept saying that everything is ok between us. But it wasn't, you could felt that kilometers away. It passed 5 months since than but I just can't let it go. I think the reason she ended our friendship is that i'm not wealthy enough. I'm not a daughter of a richman, but I always payed her a drink or gave her change when she needed it. I loved her so much, that I was ready to donate her whatever organ she would need if something happend to her (nothing happened to her, but if it had). And she just stabbed me in the back. I still want to make things between us better. I'm usualy the one that apologizes even if it's not my fault, but in this situation I really don't have to apologize. O man, now I see I wrote a novel up here =) My simple question is: does anybody knows a way to make things better and to repair this friendship? What should I do? Should I even bother or should I forget about her, move on and find new friends? All responses are welcome!