Early '30s birthdate is definitely incorrect. Here she is with her great-grandmother, mother, and uncle in 1930, age 2:
"United States Census, 1930," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:SPWT-9C2 : accessed 1 March 2019), Blanch Potter in household of Syntha Potter, Jamestown, Fentress, Tennessee, United States; citing enumeration district (ED) ED 1, sheet 4B, line 79, family 82, NARA microfilm publication T626 (Washington D.C.: National Archives and Records Administration, 2002), roll 2247; FHL microfilm 2,341,981.
Joyce, Richard, and Blanche Leugers, Cincinnati, Ohio, 1940. Consistent birth info Tennessee 1928.
"United States Census, 1940," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:KWPZ-C5Q : 15 March 2018), Blanche Leugers in household of Richard Leugers, Ward 5, Cincinnati City, Cincinnati City, Hamilton, Ohio, United States; citing enumeration district (ED) 91-60, sheet 6B, line 54, family 127, Sixteenth Census of the United States, 1940, NARA digital publication T627. Records of the Bureau of the Census, 1790 - 2007, RG 29. Washington, D.C.: National Archives and Records Administration, 2012, roll 3189.
No closer to finding her father, though.