I have that Isabella Bowman Richardson Turney died 1915 in Iowa - she was the widow of a Daniel Morgan Turney who died 1897 in Gregory County, South Dakota.I would not be surprized to find some of her children had moved to Iowa and that is why she was living there.
I don't have anything on Iowa, but I do have a little on SD.....a couple of Isabella Turney's children stayed in Gregory Co SD.
This is all the line back to Daniel Turney born 1758 VA and his wife Susan Matheny. These Turneys spent some time in Coles Co Illinois, then to MO, AR, Kansas, and finally SD....with some probably moving to Iowa.
Let me know if you think these might be your Turneys.