Along with her dissertation, the decades-long pattern paints a picture of sloppiness, at best, and willful dishonesty at worst.
The whole sorry business is recounted here.
The plagiarism matter is entirely separate from the main show, however, in my opinion.
The character pattern of willfully omitting attribution involved in plagiarism is certainly related to the habit of Hamas defenders ignoring Hamas' crimes against Israel, of course, but it distracts from the issue which made Claudine Gay an issue in the first place.
She and the other university presidents could not bring themselves to say unequivocally that calls for a genocide of Jews violated their campus bullying and harassment policies.
Focusing on Gay's academic failings is already obscuring that.