(As in the title)There was a novel about a girl who was reborn as a white dragon, and live in a remote area (with animals friends?) at first but then shape-sifted into a human and became a maid at a knights garrison, she ended up eating the commanders arm, and re-growning him a new one. I believe dragons are revered in the knights nation and she also found the captain really tasty so she is having to hold her self back from literally eating him.