Birthdate is unlikely to be forthcoming, as there were no birth certificates at that period, and only the baptism was recorded in most cases.
Sources
"England Births and Christenings, 1538-1975," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:NP6R-XQP : 30 December 2014), Philip Frost in entry for Mary Frost, 25 Feb 1755; citing KINGSBRIDGE,DEVON,ENGLAND, reference ; FHL microfilm 6,035,471.
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DNA Connections
It may be possible to confirm family relationships with Mary 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 Mary: