The Yellow Wallpaper which she refers to is a short story by the feminist writer Charlotte Perkins Gillman who wrote the story in light of her own post natal depression in which a woman imagines someone crawling behind the wallpaper in her convalescent room. It is a powerful story of insanity that could have been prevented if women and their ‘problems’ were treated differently. You can read it for free on the Project Guttenberg website.