She tries to flee

Gasping at her sudden exposure Miss Opal - Tabitha - spins on her heels, turning back towards the door.

"You had better not be planning on leaving my class!" Miss Sullivan shouts, but Tabitha doesn't pay attention. She pulls open the door, darting out into the corridor beyond and getting several steps along it before realising she has no idea where she's trying to get to. Her skirt is still left behind in the classroom, and now she's trapped out in the corridor, with no plans. She could try the locker room where her gym kit would be in her locker, or perhaps just a dash to the rest rooms to find help.