May was born on 18 Dec 1900 in Nebraska. (1930 census)
She shows up in several censuses with the Indian name We-hun-kaw, which is for Wīhą́gā, a birth order name given to the Second Daughter.
In 1930 she was living with her uncle James Seymour in Thurston County, Nebraska. Not long afterwards, she passed away on 18 Mar 1931 (aged 30), and is buried in Winnebago Cemetery, Winnebago, Thurston County, Nebraska, USA. (Find a Grave)
Find A Grave, database and images (accessed 30 December 2019), memorial page for May Seymour (28 Dec 1900–18 Mar 1931), Find A Grave Memorial no. 66579941, citing Winnebago Cemetery, Winnebago, Thurston County, Nebraska, USA ; Maintained by kmapp (contributor 46799577) .