Since the Missouri Death Records are now available on line, I checked for Narcissa's death certificate and found it.
MO Death Cert #12764 - filed Carter Co., MO - Kelley Twp. Narcisy Willfield Hunt female white widow b. March 1829 North Carolina - d. March 16, 1912 in Carter Co., MO - cause unknown - died suddenly and heart failure suspected. Father's name: Sylermother's name: unknown Informant: Fred Kelley (son in law)
She was taken to Ripley Co., MO to be buried by son, W.H. Blanchard - possibly to Lewis Cemetery where other children were. No headstone.