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Her name is Hebrew for "princess"
Sadie is the picture of a doll, with long curling golden hair and usually wearing large frilly dresses and skirts. She lives comfortably in an old English mansion and spends quite a bit of time chatting on the telephone as a personal advisor and intelligence source for various people around the world (but her brother thinks she's just racking up a phone bill on nonsense).
During the war, she took care of the messenger pigeons and developed codes to send encrypted messages to soldiers out on the field. Nevermind the fact that her "war uniform" is completely impractical and not suited for battle.