Seems fine to me.
Embracing sin as a way of life is anathama to Christainity (or should be...). If her parents were professional hit men/women, or professional theifs etc, or members of a swingers club, I would expect the same decree.
I agree to a point. And I certainly agree the school has a right to take or deny any student they wish. I just hope we all realize that all sin is an anathama to God. Not just ual sins and not just other peoples. Our own, too.