'What makes an hero?' -Matthew Winkler, Ted-Talks

from this information compared to the film 'Frozen', I believe the character Anna ( Elsa's sister) is in fact the hero of the story. She is the one who goes on the journey, to find Elsa, meets the mentor, Kristoff, fights off the snow creatures, left to die by Hans. Try's to fight off the magic, saves Elsa. Then dies, by freezing to death. She is the  reborn, and is reward by her sisters love, and a new equilbruim.
Because of this, I need to find what role 'Elsa' plays.