Nancy was already widowed by 1850. She is recorded with her sisters Joyce and Aletha in the 1850 and 1870 census.

1850 census of Fleming Co., Ky, division 2, enumerated 14 Sep, lists on p. 84 as family #582:
Isaac R. Cassity, 51, farmer; Joysea, 43; Mary, 20; Jane, 18; Malinda, 16; Nancy, 15; Amanda, 13; Sally, 11; America, 7; Martha, 4. All born in Kentucky. Jesse Davis, 95, b. Va. Nancy Wilson, 51, b. Ky. Aletha Davis, 36, b. Ky.

1860 census of Rowan Co., Ky, Morehead P.O., enumerated 14 Aug, lists on p. 42 as household #324/328:
Nancy Wilson, 61, farmer, b. Kentucky.

Next door, in household #324/328, is Aletta Davis, 40, farmer, b. Kentucky, also a head of household living alone.

1870 census of Rowan Co., Kentucky, Cross Roads precinct, enumerated 28 June, lists on p. 4 as family #28:
Cassiday, Joycey, 62, farmer; Wilson, Nancy, 70; Davis, Aletha, 59; Cassity, America, 24. All born in Kentucky.

In 1880 she is living with Isaac and Joyce’s widowed daughter Martha:

1880 census of Rowan Co., Ky, Cross Roads precinct, enumerated 1 June, lists on p. 16 as family #128/143:
Allen, Martha, 33, farmer, widowed; George W., 14, son; Minnie, 11, dau; Wm E., 9, son; Martha, 6, dau; John E., 3, son; Samuel, 1, son. All born Ky Ky Ky. Wilson, Nancy, 81, aunt, widowed, b. Ky Va Va. Padgett, Jane, 17, servant, single, b. Ky Ky Ky.