As far as violating the issur of “Lo sasuru aharei eineyhecm…” goes, it is very possible ( I just need to research it more) that she is not allowed to have hirhurim about any man because she is a niddah. For sure, she is not allowed to have hirhurim about forbidden relatives (brother-in-law etc.). But, anyhow, the Shulchan Aruch forbids reading dirty books (kol she ken movies with dirt) because it brings yetser horah on a person.
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