What is the theme of "The Yellow Wallpaper"?

The story may be construed as the revelations of a woman
being overwhelmed by madness over a three-month period. Confined mainly in the top room
of a mansion as a prescription to cure a nervous disorder, the narrator sinks into
schizophrenia, characterized by her identification with a woman within the walls who
seems to be clawing her way out of the grotesquely baroque yellow wallpaper adorning the
room.The power of this story depends on the fact that the narrator describes some of the
details without totally understanding their place in her increasing disassociation from
reality. We learn in paragraph 32, for example, that some of the wallpaper in her room
is torn. A natural conclusion is that she herself has torn it (for she tears it
completely as the story progresses), but has begun doing so unknowingly—a symptom of her
illness. Similarly, her bedstead has been bitten, and we learn in paragraph 230 that she
has bitten it at least once. Is it fair to conclude that she has been gnawing the wood
regularly during the period of her confinement? Additionally, she mentions the
temptation to jump from the window (paragraph 240), but observes early in the story that
the barred windows must have been placed in the room as a safeguard for small children
(paragraph 31). Questions: Were the bars installed initially for children, or for her?
Or was the room selected for her because of the bars?