↑ "United States Census, 1850," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MXST-WKR : 9 November 2014), Margaret Poterfield in household of John Poterfield, Smith, Belmont, Ohio, United States; citing family 2164, NARA microfilm publication M432 (Washington, D.C.: National Archives and Records Administration, n.d.).
↑ "Ohio, County Death Records, 1840-2001," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:F6FV-WMF : 1 March 2021), Margaret Porterfield, 23 Dec 1871; citing Death, Smith Township, Ohio, United States, source ID v 1 p 52, County courthouses, Ohio; FHL microfilm 902,133.
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DNA Connections
It may be possible to confirm family relationships with Margaret by comparing test results with other carriers of her 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 Margaret:
Robb-2161 and Robb-788 appear to represent the same person because: Some strangeness with the dates, but otherwise locations seem similar, and children/spouse match up.
Note: Source data (Family Search) shows father John's date of death to be in the year previous to the birth of Margaret. I imagine it is possible he died after she was conceived, but prior to her birth, although I haven't found supporting evidence of this.