Die Gänsemagd (2009)

Princess Elisabeth, the beautiful only child of a widowed queen is sent off to marry the prince Leopold to whom she is betrothed. Before she leaves, her mother presents her with a small token. This token provides her with magical protection. However, the maidservant Magdalena, who accompanies the princess treats her very brutishly, and when circumstances cause the princess to lose her token, the maid seizes the opportunity to force the princess into trading places. She makes the princess switch clothes with her.