Here's why:
* Snow Witch: The main antagonist, Elsa, has ice and snow powers and is often referred to as a "snow queen" or "ice queen".
* Magic Mirror: While not a physical mirror, Elsa's ice powers allow her to see through her ice palace and the surrounding area. This functionality is often used in a similar way to a magic mirror.
Let me know if you have any other details or if you are thinking of a different movie!