Do you know who she married?If she was living in Iowa in 1925 the Iowa State Census would name her parents.Or any of the 1900 - 1930 census would give the states of birth of her parents which might help narrow things down.
One of your other posts gave her the middle name Katie
1885 Iowa State Census, 5th Ward, Iowa City, Johnson county, Iowa
Schmidt, John, 33, cooper, b. Germany
Elizabeth, 23 or 25, germany
Adolphus, 9, Germany
Carl, 8, Germany
Jacob, 7, Johnson County
John, 5, Johnson County
Katie, 3, Johnson county
Bertha, 1, Johnson county
A 1925 census on what might be Bertha has her parents as John Schmidtt and Elizabeth Schwinn of Germany
If Anna Katie marreid a Jensen, then Elizabeth Schwinn would be her mother, especially if they moved to Scott County.
Iowa only began recording births in 1880, and it was spotty at that time.If she was born 1881, her birth may or may not have been recorded.