Margaret was born about 1765. She passed away about 1830.
Sources
Marriage certificate found here: "Virginia Marriages, 1785-1940," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:X5YP-5FZ : 11 February 2018), John Creel and Margaret Dodson, 17 Apr 1797; citing Pittsylvania, Virginia, reference Page 23; FHL microfilm 33,326.
Also she is found in census data of close family. I will attach those to her ASAP.
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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:
Margaret Dodson married John Creel not a Barnett as listed in her names. The marriage record in the sources is for Margaret Dodson and John Creel. Margaret's name needs to be corrected or a source added for a marriage to a "Barnett".