Mrs. Fairfax fits into the allegorical structure of Jane Eyre by showing herself as just a kind woman, not very deep, but being a great point of support and escapism for trouble and Jane.
On the basis of this, we can explain the other points of the assignment as follows:
Mrs. Fairfaz is a very kind lady who works as a housekeeper in the house where Jane worked. She took Jane in, gave her good advice, and always acted like someone Jane could count on.
She is a flat character, she has great meaning within the story, as she represented an escape point for Jane, someone where she found support and affection and could be herself in the face of the difficulties she faced.
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