Thanks for the best answer star--though I'm not sure I deserve it if the two profiles end up being the same person after all. I am still working on this puzzle, but these Swiss Mennonites in Pennsylvania in general (and Yoders, Beilers, and Rupps specifically)--have quite a lot of cousin-marrying going on over multiple generations. Perhaps Barbara was a Rupp, but we don't yet have a source to show it.