My baby book gives Joyce L Wilson's parents as Harry (Edwin) Wilson and Mary Turner. Both of these names have been revised, the initial entries erased, perhaps indicating uncertainty and a correction by the biological mother at the time her daughter visited her with the new baby in 1952. The 1920 Census lists a daughter of Harry H Wilson and Mary E Turner of Augusta, Eau Claire, of precisely the correct age (as Joy A Wilson, born in 1912). Joy/Joyce does not appear in the official Turner family genealogies, however. Considering that the whole thing must have been an enormous family scandal this perhaps is unsurprising (she was 'dead to them').
Joyce Wilson's two daughters were raised by the immediate family of the father, and later various relatives. Joyce Wilson herself moved to Chicago, later married for a time a fellow named Schroepfer, and died in 1974. She was an alcoholic (not surprising). My mother visited her a few times (once with me in 1952, but I was only a few months old then).
She is not known to have had any children with Schroepfer.