What fairy tale is the 2004 movie "Ella Enchanted" an update of?

The 2004 movie Ella Enchanted is an update of Cinderella. It follows the familiar pattern of an abused young woman, a royal love interest, a magical transformation, and a struggle to escape an oppressive household, while adding comic fantasy and a more active heroine.

The film stars Anne Hathaway as Ella, who has been placed under a magical spell of obedience. She must obey every direct command, even when it harms her or conflicts with her wishes. That enchantment replaces the traditional Cinderella story’s emphasis on servitude with a literal magical problem that Ella must overcome through courage and self-determination.

Ella Enchanted was loosely based on Gail Carson Levine’s 1997 young-adult novel, which itself reimagines Cinderella. The movie takes substantial liberties with that book, adding songs, characters, and a broad comic tone. It is therefore best described as a Cinderella retelling or update, not a scene-for-scene adaptation of the traditional fairy tale.