Mary is shown as a submissive, dependent woman who only knew how to engage in domestic activities and who would not know how to live alone.
We can arrive at this answer because:
Mary is portrayed as a stereotypical housewife who is devoted entirely to her home and husband, being dependent and submissive.
This kind of characterization is important to shock the reader with the coolness that Mary acts towards her husband's death and investigations into the murderer.
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