I haven’t tried updating their document on my computer, so that could be worth experimenting with. I don’t think the document is syncing with a traveling library, though, because the student was making other edits to the citations in their EndNote library (like fixing the capitalization of article titles) and those changes were being reflected in the Word document right away.
Thanks again for all your time and suggestions, Leanne - I’ve really appreciated it! I might try contacting the student to see what happens if they open their library/Word document on one of our lab computers instead of their laptop.