I hate to be a downer, but the thing she provided doesn't prove anything, sadly. One of my friends works in education, and she says that at this point even asking students to hand in a document with an edit history is pointless now because a lot of them just type the stuff they get from AI manually.I did look at the proof post she linked to for her fanfic and by the looks of it, it's human writing as I don't think ai does edits or things like that
Also, the way she showed the edits made me go ???. As far as I can see, this is not edit history from Google doc (it highlights any added words), so it is done in editing\proofreading mode in a text editor like Microsoft Word or smth similar. Now I am not saying no one ever edits their work in editing mode, but this is very... errr... unusual, to put it mildly. I'd also say that she either doesn't know basic grammar (one of the examples in her fic is: you watch her for a moment — the line of her jaw, the way the light catches... This should be a colon, not a dash. There are two reasons why there would be a dash: you don't know rules or you used AI.)
When AI first came out I played around a bit with it; not character ai, but more sophisticated 'writer' models. Her stuff reads like what these models put out almost to a T. The biggest tell for me is not even the improper dashes or antithesis, but what I call 'triplet parallelism': for some reason AI loves to create sequences of three near-identical rhythmically or grammatically structured sentences.
