Thank you both. As Manuela says, I am looking for protestant records. (Unfortunately I do not have an account on archion.) I have meanwhile found a marriage record in Stuttgart-Wangen, where she is named as the widow of one Jacob Metz, Beisitzer und Tagloehner in (Stgt)-Berg, with the parenthetical remark that the Registry of Souls from 1769 has more details. The diocese of Stuttgart, however, is a dog's breakfast on ancestry.com, as they make no distinction between Stiftskirche, Heslach, Gablenberg, Degerloch, etc. These are the places I have worked with so far, but I have not come across the registers from Berg yet. I am working on cataloguing the collections as I come across new items in my research, but it is horrendously slow.