Thank you rathmore and Kiltaglassan. Her husband William died Mar 1, 1876 and there was no obit for him either. Although it says niece Margaret Caulfield was present at death, I believe it was her granddaughter. Of course, I might be missing a sibling for her husband. Nancy had a son Robert Caulfield who married Annie Mary Porter and they had a daughter Margaret Jane who didn't marry until 1907 so still should have the name Caulfield.
Peggy