Incopy user can see changes I make in Indesign, but I can't see the changes they make in Incopy

My client is using IC to proof their catalog, which I created in ID. The client has had no issues for the last year while working at their office and using IC. Now they are at home and proofing on their home computer using IC, and her edits aren't coming back to me. When I go to open the file in either ID or IC, I don't see any of her changes, nothing has been updated, and the Update Content button is grayed out. She says she has been checking in and checking out and she sees all the changes she has made on IC, but I don't see them. However, she can see all the changes I continue to make to the ID file.

The ID file is in Dropbox.