Amazing! Do you have a scan of the photo that you can share with Barbara?
Do you know if Anna is a sister to the Friedrich Wilhelm Gottschalck discussed in this thread? Charles Scheffel (Charles von Scheffel) was a witness to the marriage of Friedrich Gottschalck. They could be friends, but it seems more likely they are family.
Do you know who are the parents of Anna Gottschalck? Friedrich Gottschalck?
Do you know where they came from in Prussia?
I presume you don't know, or you would have said. But thought I'd ask!