Prisoner of Cabin 13 is a novella written by John Vornholt. It was first published in 1998 and was the eleventh book in the Sabrina the Teenage Witch book series.
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Under Her Spell
Sabrina's excited to be a counselor at Camp Bearclaw--until she gets her cabin assignment: Cabin 13, the troublemakers' cabin. She tries to tame the kids without using magic, but they're out of control. When they have a pillow fight that covers the cabin in feathers and stuffing, Sabrina finally losses her temper and casts a good-behavior spell.
Now her campers are amazing everyone with their obedience. But Sabrina knows they can't win the big Tug of War competition if they're acting like well-behaved robots. And she's getting a little bored with her perfect little campers. Should she remove the spell, or is she asking for more trouble?