Try to apply a Cathlic high school in your case.

They do not charge too much. And, harder on rules, and students codes. If you can find one in your area is the best, because you could check it out personally. Don't worry too much on American collage admission. An general state collage admission here dose not ask for star students. She will be able to get into a college here, one way or another. Your real task is to encourage/help her to make good friends, and lead/pull her away from bad influence...