Was she supposed to make up her own “job” rules? School administrations today are notorious for disempowering the adults. She was a figurehead, designed to be such by her employers. If she was at any fault, it was for being old fashioned enough to believe that just being there as a grownup with the kids would get them to behave themselves.
My daughter in our little town had a teacher with over 40 years in the job. She quit the next year because the school refused to let the teachers use the most minor forms of control and discipline. In her own words, that’s the only reason she quit. She would have taught into her 80s had the situation been different.