Not sure, but from the info that you gave, this looks like the Propst female you might be looking for.
WV Marriage Index, 1785-1971 Name: Elma Propst Gender: Female Birth Date: abt 1904 Birth Place: Calhoun County, West Virginia Age: 17 Spouse's Name: Norval Hopkins Spouse Gender: Male Spouse Age: 27 Spouse Birth Place: Calhoun County, West Virginia, USA Marriage Date: 19 Mar 1921 Marriage Place: Calhoun, West Virginia Marital Status: Single Father's Name: Fy Propst Spouse Father's Name: Wesley Hopkins
If this is the correct person, then there is a family file on Ancestry, TMCKRoots, that says her parents were: Philander "Fye" Propst(8/1876 WV-1/23/1961 Washington, OH) and Ella Ball(10/1877 Calhoun, WV-1/19/1974 Muskingum, OH).
Ella's parents: Emery M. Ball (1841-1918) Hannah Elliott (1847-1889)
Philander's parents: James M. Propst (1847-1902) Sarah Margaret "Maggie" Elliott (1851-1892)
I didn't see a family tie between Hannah and Maggie, but there is probably one if a person gets to really looking into it.
I could not locate Elma on a census with Philander and Ella, so not sure this is the correct family; except from the marriage record.I did locate Philander and Ella in Ohio 1920 (Elma is not in the household) however they are back in Calhoun, WV by 1930.1910 Center, Calhoun, WV census there is a listing for an Elma M. Propst, age 4, in Philander & Ella Propst's household, age could have been incorrect as the middle initial.This family is listed right after the Emery M. Ball family.