Kerry Roblett said her daughter, a Year 11 student, brought a note explaining she needed to wear trainers due to a recent foot injury.
Despite this, she was denied entry and sent to isolation in the sports hall with at least 40 other students, the mother said.
She explained: "[In isolation there are] no pens, no paper, no work, no nothing. Literally, you just sit there and you do nothing.
"The rules are a little bit unfair. We feel the children definitely aren't getting heard, and they're definitely getting treated like criminals."
The school responded: "For any pupils away from their peers, we provided the same induction activities."

