Ollie was born about 1867. She married a Mr. Shafer around 1886. He died before 1900.
The 1900 U.S. Census for Iron Township, Bismark City, St. Francois, Missouri, finds the following family: Ollie Schafer, head, widowed, age 34, born in MO; John R. Schafer, son, age 12, born in MO; Mary M. Schafer, son, age 10, born in MO; Emma Schafer, daughter, age 6, born in Misouri.
Ollie married George Duren around 1903.
The 1910 U.S. Census for St. Francois, St. Francois, Missouri, finds the following family: George W. Duren, head, age 53, born in MO; Olie Duren, wife, age 43, born in MO; Edward Duren, son, age 23, born in MO; Aliza Duren, daughter-in-law, age 26, born in MO; Homer Duren, son, age 4, born in MO; George Duren, son, age 6, born in MO; Emma Shaefer, step-daughter, age 18, born in MO. The translation incorrectly says 'Emma George'; check the original document.
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United States Census, 1870," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M4F4-42W : 12 April 2016), Nancy Fortner in household of John Fortner, Missouri, United States; citing p. 33, family 237, NARA microfilm publication M593 (Washington D.C.: National Archives and Records Administration, n.d.); FHL microfilm 552,324.
United States Census, 1910," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M2B1-215 : accessed 3 March 2019), John R S?Hafer in household of Nancy ? Fortne?, St Francois, St Francois, Missouri, United States; citing enumeration district (ED) ED 95, sheet 3A, family 39, NARA microfilm publication T624 (Washington D.C.: National Archives and Records Administration, 1982), roll 808; FHL microfilm 1,374,821.