Two loosely-connected versions of Elsa exist in Lydia the Bard's villain songs: In "Let it Go," Elsa is fed up with Anna's pushing and decides to spread her pain throughout the entire kingdom; in "Into the Unknown," Elsa is overtaken by grief and her own powers, which have gone out of control. Lydia has stated that they could exist in alternate universes, or "Into the Unknown" could represent Elsa facing the consequences of her actions.
Art by NJ! for "Into the Unknown" and QNJazmine for "Let it Go."