How To FREEZE Elsa! (Disney Frozen 2)

Frozen 2 was one of the highest grossing movies of 2019 and, like most of the world, I saw it. Since then one scene has been getting my Theorist brain in a tizzy. We see Elsa freeze, which came as a total surprise to me! The previous movie tells us that the cold never bothered her and yet, here we are. So my question is, HOW do you freeze the ice queen herself?