There is a popular children's book series called "The Scary Godmother" by Jill Murphy. The books are known for their lighthearted, humorous take on spooky characters and Halloween traditions.
The "Scary Godmother" books have been adapted into:
* A TV special: "The Scary Godmother" (2003) aired on Cartoon Network and features the voice of Carol Burnett as the Scary Godmother.
* A direct-to-video movie: "The Scary Godmother: Halloween Spooktacular" (2005) features the voice of Melissa Joan Hart as the Scary Godmother.
It's possible that you might be thinking of one of these adaptations or another Halloween-themed movie or show with a similar concept.
Let me know if you have any other details about the film you're thinking of, and I'll do my best to help!