"MirrorMask" (2005)

Helena, a 15-year-old girl in a family of circus entertainers, often wishes she could run off and join real life. After a fight with her parents, her mother falls dangerously ill and Helena is convinced she is to blame. She dreams she is in a strange, doomed land with opposing queens, bizarre creatures and masked inhabitants, and only she can restore the balance by finding the MirrorMask.