This girl isn't a harlot, nor is she sinning. Why punish the girl?
It's not about punishment. It's about abiding by terms agreed to when the kid is signed up to go to private school.
You have fallen into the trap. This girl's mommies set her up. It is a private school. If they did not know of the rules beforehand (which I doubt) they are stupid, stupid, stupid. If they were aware of the rules, they were setting the girl up for expulsion.
We already have very little say in what goes on in public schools. If we start ceding ground on private schools, we have lost the battle over organized education entirely.