When the world plunged into chaos, she was the one who stopped it. After the defeated of the world eater, Lord father, Akatosh came for his eldest child, but before the father of all dovah reclaim Alduin's soul, some part of the world eater's soul escaped Nirn to another plane of existence. In order to completely reclaim all fragments of Alduin's soul, Akatosh sent his youngest child to another reality. "you must stop him, before he devour all of them" no matter what happened, she must bring her brother back to where he belongs.