I think the mother just started going crazy on her own and both parents blamed Samara so they stuck her up in the barn. This could be why she became so evil and eventually was killed at the hands of her mother. Or maybe from the minute she was born she was evil but just led Rachel to believe she wasn't so she could be set free.
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"I'm not gonna hurt you, I'm just gonna bash your brains in. Right the fuck in."
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