First of all, doesn't matter if she was paid or not, she had authority. With authority, you don't give two shits about respect, it's all about consequences. If the kids know you're a pushover and they can do whatever the hell they want, some inbreed jackasses will do it. If you had any experience working with kids, you'd know that.
Secondly, it's not about how nice a person is, it's how competent you are at your job, she didn't seem to be.
By my logic, stop the bus, take down names, get the students suspended or worse, move on with your life. She is not a kid attending their school, she is a grown woman hired (for money or not) to keep the children in the bus safe.
But yeah, i guess i'm alone in my beliefs. If my kids would have been in that bus, the school board would have had a lot of explaining to do.