The author change the yellow wallpaper to allow the reader to get more information about the narrator by changing the perspective and allowing the reader to see the narrator from another character's point of view.
"The Yellow Wallpaper" describes the declining mental health of a woman most likely suffering from postpartum depression. She becomes increasingly obsessed with the patterns of the yellow wallpaper in her bedroom, and starts to believe she can see a creeping woman, trapped behind it.
The wallpaper symbolizes is the narrator's mental state, because the narrator (the woman writing her diary) is having a mental breakdown; the problem is not her social status, physical health, or the relationship with her husband.
Thus, this could be the answer.
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