"Maryland Births and Christenings, 1650-1995", database, FamilySearch (https://familysearch.org/ark:/61903/1:1:HYG6-MQMM : 12 February 2020), William Tannehill in entry for Jemimah Tannehill, 1775.
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DNA Connections
It may be possible to confirm family relationships with Jemimah 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 Jemimah: