Perhaps it is for the show. After all if she is sent away to another world or whatever? Someone put that mark on her to identify her. Tattoos can be like id. I’m sure Emma does not have a card saying she is the savior and how can non believers trust the word of a person who began as a non believer? In a lot of movies the hero is identified by birthmark, tattoo, or scar. The mark was put on her after the wardrobe and in the next world probably by that seven year old boy or what have ya.
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