As a teenager, she attended Regal Academy and was friends with Astoria, Hawk, Joy and Travis' parents. She was also the guardian of the gateway between the Fairy Tale Land and Earth. In "The Parents' Day", Astoria's mother comments on how Clara used to be in detention a lot, implying that she was a troublemaker back when she was a student. Snow White clearly shows her dislike for Clara, blaming her for the loss of Cinderella's glass slipper.
Rose had managed to keep her enrollment at Regal Academy a secret until "Attack of the Shortbread Witch", when Clara found her magic gate key in her backpack. Clara then asks Rose to pick up a Red Angel's Kiss flower on her way home from school, then mentions that they only grow in Regal Academy, exposing Rose's involvement at her former school. She grounds Rose and kept her barricaded in her room until Rose eventually sneaks out to save her school from the Shortbread Witch. After Rose returns, Clara saved her from the witch with her Ballgown Magic, and Rose admits about her going to Regal Academy instead of her high school on Earth. Clara forgives her and allows her to keep attending Regal Academy for the time being.