Bertha was born in 1901. She was the daughter of Mallory Calhoun and Ida Dopp. She passed away about 1973.
Sources
"Iowa, County Births, 1880-1935," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:KHTY-4QL : 20 May 2016), Mallory W. Calhoun in entry for Bertha Lucile Calhoun, 14 May 1901; citing Clear Lake, Cerro Gordo, Iowa, United States; county district courts, Iowa; FHL microfilm 1,503,077.
"United States Social Security Death Index," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:JT74-K6L : 19 May 2014), Bertha Hanson, Dec 1973; citing U.S. Social Security Administration, Death Master File, database (Alexandria, Virginia: National Technical Information Service, ongoing).
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DNA Connections
It may be possible to confirm family relationships with Bertha by comparing test results with other carriers of her ancestors' mitochondrial DNA.
However, there are no known mtDNA test-takers in her direct maternal line.
It is likely that these autosomal DNA test-takers will share some percentage of DNA with Bertha: