>>>>Sorry, I have to go against what the father did. There had to be other options.
Open the can of whoop-ass on the Principal, teachers, and bus driver who did nothing to stop what was being done to his daughter is the other option, that should be exercised immediately.
In the 50s, a Principal allowed my brother to be victimized and did nothing to help him so Dad did just as you said. He went to the Principal's office, confronted him and knocked him to the floor. I didn't get so much as a phone call from the police. I was amazed. Dad told me, "You have to be right and even then it might not turn out in your favor".