Miss Havisham towards the end of the novel becomes tired of avengance and regrests the pain she has caused Estalla and hence her lovers. This realisation comes from Pip returning to the house and demmanding an explanation to Estella's birth and then him ignoring her calls as he left. Overall she was tired of life and wanted to end it herself.
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Miss Havisham sets herself on fire in the novel "Great Expectations" as a form of self-destruction after realizing the harm she has caused through her actions and the pain she has inflicted upon herself and others. It is a drastic act of atonement and an expression of her desperation and guilt.