Due to the abnormal life situations she happens to face at her childhood.
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I wouldn't say Jane is Psycho. That's a pretty bold statement. Jane does have a troubled childhood. She thinks she sees ghosts (like uncle in the "Red Room") and she feels certain connections with people. That doesn't make her crazy. I think Jane is a sensitive girl. She undergoes hardships for most of the story. Much of what she does and experiences allow her to cope with her harsh reality. In the end, her sensitivities do lead her back to her "love" a blind Mr. Rochester instead of entering into a loveless marriage with St. John. To say Jane is crazy would be a misreading.