At the time of the 1900 US Census, head of household Heinrich Weidenbach Jr. (age 36, born in Russia) was living in Lesterville Township & T.96-R.57 Lesterville village, Yankton, South Dakota, United States with his wife, Elisabeth Weidenbach (age 30, born in Russia), their six children: Emil Weidenbach (age 11, born in South Dakota), Bertha Weidenbach (age 7, born in South Dakota), Clara Weidenbach (age 5, born in South Dakota), Theotor Weidenbach (age 3, born in South Dakota), Herbert Weidenbach (age 1, born in South Dakota), and their servant, Christian Hauck (age 16, born in Russia). 
↑ "United States Census, 1900," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MMRF-H3M : accessed 15 September 2017), Bertha Weidenbach in household of Heinrich Weidenbach Jr., Lesterville Township & T.96-R.57 Lesterville village, Yankton, South Dakota, United States; citing enumeration district (ED) 347, sheet 8A, family 134, NARA microfilm publication T623 (Washington, D.C.: National Archives and Records Administration, 1972.); FHL microfilm 1,241,555.
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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: