If those photos are true and not a big ‘look at how disorganised I am’, only for her to whip out a ‘look what I’ve done, I showed you all’ finished book (frankly, wouldn’t put it past her)
then ... yep, if she’s at final author edits stage then it would be highly, severely annoying and inconvenient for the copyeditor (if there is one, who knows?) to have to make sense of her pages of handwritten notes. They would need typing up and added to the existing proof. There would have to be a whole new set of proofs generated aaaaand printed out and checked, if not by her mucky hands, then someone else’s. Don’t know how the publisher is allowing this tbh