Appears on the 1870 census in the household of her father, Solomon Mercer.
Sources
"United States Census, 1870," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MCS1-NTT : 17 October 2014), Marietta Mercer in household of Solomon Mercer, Georgia, United States; citing p. 70, family 440, NARA microfilm publication M593 (Washington D.C.: National Archives and Records Administration, n.d.); FHL microfilm 545,647.
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DNA Connections
It may be possible to confirm family relationships with Marietta 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 Marietta: