At the time the police gave her medical information to the media, she was a private citizen and she was not under arrest or facing charges.
The police can’t do that.
She’s a public employee charged with the safety of minors. I assume things have changed all that much in the decades since I was a kid and parental consent was needed for this field trip.
That consent comes with certain expectations of the parents in regards to the safety of their children.
Acts of God and traffic accidents are one thing; falling down drunk by one of the chaperones IS NOT!