Jennifer had been forced to marry someone sensible by her father. He'd had enough of getting his daughter out of trouble. It was partly his fault that she turned out to be a rich, spoilt brat. He thought the principal of a school for wayward girls would be able to handle her, maybe even tame her.
Jennifer couldn't face the prospect of losing her allowance and having her wings clipped, so she agreed. Give it a few months and the boring man would divorce her, meaning it wouldn't be her fault and she could go back to having fun with her friends.
Intrigued as to how her husband ran the school for delinquent girls, she decided to take a job there in administration. Using her maiden name, so no one would know who she was, seemed to be a fun idea.
Unfortunately one of the girls decided the woman needed a moment of humiliation, to put her in her place. Helping out the arrogant woman with the paperwork, she presented to her an Id for a student, rather than an employee. When confronted by a teacher she began to explain she was a married woman not a student, but the teacher wouldn't listen to excuses.
So Jennifer found herself spending the day as a student. It would be humiliating for anyone to find out she was the principal's wife, so she went along with the mistake. Unused to behaving herself, she started to earn demerits, which would lead to receiving the cane.