Mary and the Witch's Flower

Clumsy and bored Mary discovers a rare fly-by-night flower in the woods that bestows magical ability for only one night and carries her on a broomstick to a prestigious witch's academy in the clouds. When she accidentally reveals the flower's secret she triggers a dangerous experiment that traps her new friends inside the school. She must find the courage to face the headmistress and undo what she has done before the magic fades.