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Kidnapped by Loki when she was just a baby. Loki knew of her powers, how she can bend any element at will. To keep her from being known or taken, he kept her a secret.
Never knew of her real parents or love. Loki being the only person she knew, shaped her into what he thought was the perfect solider.
Years later, this one girl who only knew of Loki, was sent to Midgrid for a mission. To kill off the Avengers.