Some records spell her nickname as Sally, others as Sallie.
In the 1870 US Census for Boardman Township, Clayton, Iowa the family of Sally A. Barnum (widowed) was enumerated as follows:
Household #188; Family #187
Barnum, Sally A.; 47; F; W; Keeping House; real estate $2,500; b. New York
Barnum, Harlow; 17; M; W; Farm Laborer; b. Iowa
Barnum, Weatsby; 13; F; W; At Home; b. Iowa
Barnum, Lewis; 10; M; W; At Home; b. Iowa