Wordnet is not a standard dictionary, for example, if you search for "it", you will receive a helium element and the fifth letter of the Hebrew alphabet as definitions. However, you are not included in the definition of a noun referring to a person.
My best guess is that "she" is not contained, because she has no definition of anything but a noun pertaining to a woman. I say itโs better to guess because I am not a language expert, so I canโt say definitively that he has no other definitions. If you look โheโ at thefreedictionary.com, although it does have links to helium and Hebrew. If you look at โshe,โ she has only sex-related definitions.
tl; dr The reason โsheโ does not exist as a word in wordnet is because by their rules (or what you want to call) it is not a word.
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