More I found and don't know if you already have:
1) Sallie is on the 1920 census in Forsyth Co., NC, with two sons, Euguene & Collie L. (I guess Colell?)
2) On the 1930 census, still in Forsyth Co., NC, find Wilmer (written as Wilma) --- noted as brother to "head of family" Viola Clarts (sp)--- it's Clark). Cole L (Colell) also. Wilmer is recorded as married; with them is Willie (female) who is also married; on the death cert. for Willie Simon, dod Oct 21?, 1938, son of Watts Simon & Sallie Simon: it is noted that he is married and the husband of Willie Simon...so I bet that's she with him on the 1930. (Sallie died in 1928 - the death cert of online if you don't have it...signed by Viola Clark).