I've never heard of Cornelia Foster but assumed that Samuel must have married again because Caroline A. Fluitt was born in 1842 according to "Caldwell Parish in Slices-Biographies" (page. 243). It gives the following info on her. Maybe you can figure out if she belongs to one of the other Samuel's.
Caroline A. Fluitt b. February 03, 1842 in Caldwell Parish.Died Oct. 10, 1898.Buried in Old Bethel Cemetery. Married David McClary. They had the following children: 1.)Morgan S. McClary-b.May 24, 1878 d. Dec. 25, 1940.Buried in Old Bethel Cemetery. 2.)Dave McClary-b. May 29, 1880, d.February 23, 1950. Buried in Cross Roads Cem. He married Ollie Batson.
Let me know if you learn anything new about Caroline. Thanks, KP