Why would Wellesley have the copyright? It's Hillary's unless she specifically assigned, in writing, all copyrights to the College and I've never heard of that.
Arrangements with colleges are very weird.
A colleague and I wrote a paper related to a class we were taking, to present at a conference.
Our professor had his name on our paper. I imagine it counts now as one of his published works.
Of course, he did teach us, and he did sponsor our presentation, and he did grade our paper (which means he reviewed it).