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Isabella Tanikumi said Frozen copies characters, the story, and plot of her autobiography "Yearnings of the Heart," which details her transition from life in the Andes Mountains to American culture. The lawsuit is worth $250 million, according to TMZ, and Tanikumi's claims rest on the argument that Disney plagiarized her work, rather than basing the movie on Hans Christian Andersen's book The Ice Queen.
http://www.ign.com/articles/2014/09/24/woman-suing-disney-claims-frozen-is-based-on-her-life-story