What is the name of the movie where two teenage girls run away?

There was this movie and I remember watching it in the 90s (maybe mid 90s) anyway, there were these two girls and if I remember correctly, they break away from someplace, like maybe a shelter or insane asylum and it seems like they go to Mexico. I thought that one of the girls was Samantha Mumba but I checked out the movies that she was in and none of them was made in the 90s so I don't know. Anyway, one of the girls might have been white and the other either black or hispanic but they run away together because the black/hispanic girl keeps telling the white one that she knows of a place where they will be safe. I think that she keeps talking about some woman that will take care of them when they arrive. The girls travel and travel,(like by jumping on the back of trains and whatnot) until they get to some place that's real sketchy (when I was younger, I guess I thought they were in Mexico (not to dis Mexico) ) but anyway the black/ hispanic girl takes her friend to the woman that she had been talking about the whole time and its crazy because the woman turns out to be some weird child molester or something. The white girl realizes this because it seems like the weird woman tries to prostitute the girls or something but she (the white girl) tries to warn the black/hispanic one but the black/hispanic girl doesn't listen because, I guess the woman raised her, even though she molested/raped her all her life. I can't remember how the movie ends, I think the white girl shoots the woman and the girls run away again, but anyway,trying to figure out what the name of this movie is has been bugging me like crazy. If any of this sounds familiar to anyone and you know the name of the film, please let me know = )