Snow White is a magical element. She has known darkness by suffering at the hands of her stepmother but has a light burning in her. Her innocence and purity will give the Queen immortality. This can only be true if the Queen has Snow White's heart.
pinkrosesbluebow: This dress is based on the rough sketches included in the deleted fantasy sequence for “Someday My Prince Will Come” (which is on the edition DVD). I wish they had been able to animate that scene!