Her interactions with the nanny and her husband give away the impertinence that completely antagonized her. Her husband wants to tell her what is best for her and tells her how she is feeling rather than asking for her input. .
We learn very early on in the story about the narrator's illness. The first part tells us, "temporary depression-a slight hysterical tendency" for our first clues to what her illness is. The rest of the story tells us how sick she is. During the story it revealed and is supported through her actions/reactions to her surroundings. She explains her illness and how her husband and brother (both well known doctors) agree with her condition and prescribe the recommended treatment. She was to do nothing but rest. That even her writing was "prohibited" as she tells us it "does tire me so". .
The doctor rents this place in the middle of no where so she can get fresh air and rest. With the full descriptions the narrator gives us we almost picture the mansion quite like an insane asylum would be depicted. Instead of resting she allows herself to be caught up in the infatuation with the deciphering of the wallpaper. She notices every tear and discoloration within the wallpaper. It takes a few weeks for the wallpaper to change and shift just as her illness is becoming increasingly worsened. The suppressive nature of her husband is actually contributing to her obsessive behaviors. From that point on it takes only a brief period of time before she starts to make the wallpaper come to life with the ideas of women being caught behind the wallpaper. When the story reaches its climax we see how through the wallpaper, we see it is herself she is seeing. There is a major change that "sticks out like a sore thumb" which is when she speaks of the "creeping about" that the women do, and that she "locks the door when she goes out creeping". We can definitely see then that her illness has started to cross the line into complete madness.