She married Robert E. Schultz (1920-2008) in the 1940s. He remarried around 1953 and is buried in Montello, Wisconsin. As far as I know, Twyla had no children.
The tombstone reads:
The connection to the Brassfield surname is her sister, June Jerine Schauer (1928-2009), had a daughter that married a Brassfield. That would make Twyla my grand aunt.