She passed away in 1973 and is buried in East Batavia Cemetery, Batavia, Illinois.
Sources
"United States Census, 1920," index and images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/M8Y1-ZB1 : accessed 15 December 2014), Gladys Willhite in household of Henry F Barkhaus, Waterloo Ward 1, Black Hawk, Iowa, United States; citing sheet 16B, family 442, NARA microfilm publication T625, National Archives and Records Administration, Washington D.C.; FHL microfilm 1,820,478.
"United States Census, 1940," index and images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/KWHL-GZY : accessed 15 December 2014), Gladys Willhite, Ward 2, Batavia, Batavia Township, Kane, Illinois, United States; citing enumeration district (ED) 45-50, sheet 4A, family 70, NARA digital publication of T627, roll 820, NARA digital publication of T627, National Archives and Records Administration, Washington, D.C.
"Iowa, County Marriages, 1838-1934," index, FamilySearch (https://familysearch.org/pal:/MM9.1.1/XJK5-1VJ : accessed 15 December 2014), Robert S. Willhite and Gladys Anderson, 24 Dec 1919; citing Waterloo, Black Hawk, Iowa, United States, county courthouses, Iowa.
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DNA Connections
It may be possible to confirm family relationships with Gladys by comparing test results with other carriers of her mitochondrial DNA.
However, there are no known mtDNA test-takers in her direct maternal line.
It is likely that these autosomal DNA test-takers will share some percentage of DNA with Gladys: