It sounds perfectly legitimate to me. If you disagree, you can go to the school board.

You will not win a lawsuit under these facts, and it will cost thousands to pursue. Late flights/buses etc are common.

None of us can guess "why" as we don't have all the facts. You need to retain an attorney and discuss with them in private.

This is a customer service issue, not a legal issue, and outside of a lawsuit you can't get the tapes. My advice: Move on. Don't go there again.

A bad result does not necessarily mean malpractice. You will have to meet with a local malpractice lawyer who will have to retain a physician to...

You can sue her in small claims court for breach of contract.

These are matters to address with your attorney. This is not a DIY project.

Unless you have a written employment contract there are probably no legal ramifications. You can quit, they can fire you.

Unlikely. You have to prove that the delay in treatment made your symptoms worse, and that does not seem to be the case.

You can sue her in Small Claims Court. A judge will decide.