How do you understand the end of the story?

John comes home and tries to open the locked door. The narrator tells him where the key is, and he finds it and enters. He asks her what she is doing as she creeps around. She tells him that she has finally gotten out of the wallpaper despite him and Jennie, and that she has pulled off most of the wallpaper so they cannot put her back. John faints, and the narrator keeps creeping over him as she goes around the room.  Yes the ending is creepy but Gilman is trying to make a point here. The narrator becomes a product of a patriarchal and, perhaps, misogynistic society.