This is not a knock on Christianity. Only that this school would look down on this girl for "acting out of accordance with her gender" come on folks I knew plenty of girls that were tomboys when I was a kid, and most grew out of it or even if they didn't very few turned out to be lesbian. And even if it turns out she is so what? Bottom line I think this school (founded by Jerry Falwell) is telling this girl she's repulsive as a human being and that's not right
"Don't ever go against the family again. Ever"- Michael Corleone