Jennifer "Jenny" Kelley is a mortal, Sabrina's best friend in the first season. Jenny befriends Sabrina on her first day, and also introduces Sabrina to Harvey. Her disappearance is never mentioned or explained.

Jenny had a powerful social conscience and is a very honest and loyal friend. She always dreams of other worlds behind closets. Her dream came true when she accidentally entered the linen closet and met Drell. Drell turned her into a grasshopper but is saved by Sabrina and her aunts by making Jenny believe everything is a dream.