The Worst Witch 1999 S02E03

Episode: It's a Frog's Life. Ethel thinks it's Mildred's fault that Sybil is always following her around, so when things go too far during a lesson of broomstick flying, Ethel vows to get her back. When Tabby falls off Mildred's broomstick, she is sent to her room with strict orders to make sure that the cat learns to properly sit on the broomstick. Frustrated, Mildred decides to take a nap, and when she awakes, she discovers that she's been turned into a frog.