My first guess would be sexual trauma. Her Reddit history doesn't reveal much other than she's nerdy and a weeb. It's always anime so...
Someone else from that sub posted this which might some insight into the rationale behind it.
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She also posted this photo which just struck me as a bit sad.
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I think the rad fems are onto something when they talk about internalized misogyny and some women feeling confined or overly sexualized.
If this was the 70s she could have joined a feminist commune and frolicked in the woods with her tits out with the other dykes. But in current year this is the only option since actual women only spaces are troonphobic.