What do i do about a girl i care about?

theres this girl i know (and yes i like her) shes 14 im 15 and iv been raised really well if u ask me but from what i know her lifes been **** in the last couple years and i know its taken a tole we first met at school when she moved from oregon for about half of my 8th grade and her 7th and i would like to say i knewher pretty well although i never had the to ask her out, anyway her life started taking a turn for the worst after shhe moved. and we lost contact untill i was in the process of moving across the country i found hher first on myspace then on facebook at first it wwas cool we talked like normal and it seemd like she liked me (haha like when i called her once because i dont like to talk with my parents around i had to wait till they were gone and she sayd i had a hot voice lol) anyway it stayd that way for about a month untill she stopped wanting to talk to me and i later found out that she might have cervical cancer and that the reason she stopped wanting to talk was because she didnt likethat i was trying to be a good friend and help her out when she was feeling bad all because she belives that she doesnt deserve kindness in part because she says she made a man commit suicide and since i could not prove or disprove this i wasnt sure what to say, i tried to help the sittuation by laying off for a while and letting her have her space but that seemed to only drive us farther apart. then later i found out that her ex boyfriend had cancer and only had a month to live (now i still a couple months later have no idea if this is true but she did say there was something wrong before that ) and i was the one that had to tell her because she didnnt want to talk to him and she sayd she felt terrible and she wanted to kill herself i basically told her thats not the answer and that was the last conversaton we had and idk what to do about the situation