movie about girl who killed her sister

i can’t remember name of movie about girl, who had younger sister and killed her – she wanted to help her, so she killed her neighbourhood, and took her lungs (the girl was playing outside and she called her inside), and then put them in her sister .. the girls sister was ill (i dont know if it was cancer, but she was dying).. the girl had brown hair, then she cut them.. also she was lonely, she hasnt got any friends, she wanted to be doctor… and she had weird imaginations about sex..

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