Not having taken the photos doesn't mean that she doesn't currently hold the copyright to them. It would be easy for her to have a copyright transfer from the

Not having taken the photos doesn't mean that she doesn't currently hold the copyright to them. It would be easy for her to have a copyright transfer from the original photographer be a condition for inclusion in her project. (Also, I expect that there would be a separate copyrightable work for the combination of the old and new pictures, and the compilation of the series as a whole.)