Learn about other aspects of your topic (ie. feminism, abuse, hysteria) and then YOU will apply what you find to your reading of "The Yellow Wallpaper."  Here are just a few suggestions that might be helpful.  

Use one or more of the following or think of your own keywords:

[ "yellow wallpaper" AND gothic ]

[ "yellow wallpaper" AND ("gothic elements" OR "gothic tradition" OR "gothic literature") ]

[ "Charlotte Perkins Gilman" AND gothic ]

[ "Charlotte Perkins Gilman" AND ("gothic elements" OR "gothic tradition" OR "gothic literature") ]

Use one or more of the following or think of your own keywords. These could be combined with the Boolean AND or OR operators.

pospartum psychosis

Schizophrenia

Dissociative Identity Disorder

psychoanalysis

[ "weir mitchell" ]

[ insanity OR insane ]

[ depression OR "post-partum depression" ]

[ madness OR "mental illness" ]

[ nervousness ]

[ neurasthenia ]

 [ hysteria ]

[ "rest cure" ]

[ psychoanalysis ]

[ history AND women AND medicine ]

Use one or more of the following or think of your own keywords. These could be combined with the Boolean AND or OR operators.

[ gaslighting ]

[ coercive control ]

[ patriarchy ]

[ subservience ]

[ domination OR oppression ]

[ "mental abuse" OR "spousal abuse" OR "spouse abuse" ]

[ abuse ]

[ intimate partner abuse ]