Wow, I don't know how I missed this subject.

Aly, you don't owe this woman anything. For sure no visit, and I think pics are questionable too.
I think it is kind of strange (and suspicious) that this woman would want to visit- what purpose would it serve? It would not help HER with recovery, and only prolong it. She needs to move on and hopefully she has learned something from this situation. I don't want to sound cold about her situation, but I really believe that nobody would benefit from a meeting- especially her.
As far as you and Lolly are concerned, it would be better that there is no contact. All this woman needs to know is that Lolly is in a good and loving home, and that should be enough.
If she has the dogs best interest at heart, that should be enough!

I have a friend at work that rescued an abused/neglected Rottie, and after several months the former owners STOLE him back. I don't know the details of how they found the address, etc. So I think not even pics.......I hope your supervisor did not give any info out either- I would ask.
My friend DID get their dog back, and legally it was her dog, so I don't think you have a worry as far as whose dog it it is.

Good luck with whatever you do!