Just Ella by Margaret Peterson Haddix
Ella is to be married to Prince Charming because she is the one whom the glass slipper fits. At first, she enjoys living at the palace, but after a while, it starts to get boring. She can't do anything productive-all the maids do that- and the prince doesn't pay any attention to her. Ella soon realises that being a princess is not what she expected it to be and she plots to escape.
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