I am not related but this is a possible match for Erna's lineage; surname READER.
1920 census, Curtisville, West Deer Twp., Allegheny Co., PA-Reader household:
head, Emma, 30, married, bp Germany, both parents bp Germany, immigrated 190?, PA (papers applied-filed for citizenship) laundress-own house
dau, Erna, 12, bp PA, both parents' bp Germany
son, Courtney, 11, bp IL, both parents' bp Germany
dau, Elenore, 9, bp IL, both parents' bp Germany
1930 census, Harmar Twp., Allegheny, PA:
head, Emma R., 40, widow, first md at 17, immigrated 1906, PA, no occupation
dau, Erna M., 22, telephone operator
+ 2 boarders
1940 census, Pittsburgh, Allegheny, PA:
head. Arthur W. WALKER, 43, bp PA, truck driver
wife. Erna M., 30, PA
dau, Elizabeth M, 1, PA
WWII draft registration, Pittsburgh, PA. Apr. 27,1942:
Arthur WIlson Walker, b 20 Jul 1896 Pittsburgh, residence 403-44th St. Pittsburgh, person who will always know your whereabouts, Mrs. Erna M. Walker, same address. Employed by Hannon Motor Lines, Pittsburgh.
I have more information but it will include living persons which I prefer to not post online. If you want to follow up on this email me offline at luvzsun at aol dot com.