There are times when I've been upset over something one of my kids did at school...but then I remember when I was that age....we did some pretty goofy things too. Some of it is just part of growing up.
It's not like she had drugs in her locker or stole something. It was just a silly prank. I agree we have to react as parents and show kids that there is a price to pay for their mistakes....but at least it was something harmless enough. I thought in gym, especially with boys, it was almost EXPECTED behavior.
Poor Kassandra...she was probably mortified she even got in the position of getting herself into trouble. I was like that too as a kid. My oldest was also...my last two kids don't care. LOL!