@chonkury If she entered the world of a novel that was fiction to her, it would be an isekai. If she were reading a novel that was an account of or set in her world's history, it would probably be Time Travel, as it was for the MC.
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I went back and found it. Her intro was in episode 89. She gives her background (to the reader) in 92, and phrases it as, "Just because I said a few bad sentences about a transmigration novel on Weibo." Since she seems to have some familiarity with our MC, the implication is that the story we're reading is the story
she was reading, and that would actually make this an isekai for her.