Sorry it's taken me so long to reply. I believe that Susan Minnick was the 2nd wife of Johan Christopher and Susanna, the 1st wife, appears to be the mother of his children. This could be wrong, since the records are a bit muttled, but that is how it was once suggested/explained to me.
From "The Caplinger-Keplinger Family of the Valley of Virginia" by Lewis H. Yankey, page 85 (Caplinger/Keplinger marriages) "1788 Christian Kiplinger & Susan Menech".
"If" this record (above) is Christopher & Susan Minnick... then they were married a few years after all of the children were born!
I don't have a date of death for either Susan or Susanna. Can you tell me your source for the death of Susan in 1840 Highland Co.?