The KY Birth Index has an Ada M. Hellers b. June 7th 1919 in Pulaski County, mother Letha Cox.
1910 Census KY Pulaski County, Rocklick Twp is a Cox family with a daughter Letha (Ancestry's Index transcrobed as Aletha) age 7. Parents are William T. and Victoria Cox with 5 other children.
In 1930 Letha Judd reported her age at first marriage was 15, she was 17 in 1920 census married to Guster and her parents are also living in Science Hill in 1920.
Guster Hollers was single when he filed WWI Draft Registration Card on June 5th 1917. Ada was born June 1919. So look between that time frame for the marriage date.
Letha Judd died in Brown Co. IN as well as her 2nd husband Dulin Judd. They are both listed in the Social Security Death Index. You can order Letha's application to verify parents, including her mother's maiden name.