Mary was born in 1710. She was the daughter of Brian O'Beirne of co. Roscommon and Jane MacDermott of the Rock.
Sources
The Case of Count O’Rourke, Presented to His Majesty, in June, 1784, by His Excellency the Marquis of Carmarthen, Minister and Secretary of State (London, 1784), 11.
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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 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:
~0.39%Athol Bloomer :
23andMe, GEDmatch T459025[compare], yourDNAportal ATHcfd541e0
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AncestryDNA, GEDmatch T459025[compare], yourDNAportal ATHcfd541e0, Ancestry member Nachman13
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Family Tree DNA Family Finder, GEDmatch T459025[compare], yourDNAportal ATHcfd541e0, FTDNA kit #112910
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Autosomal DNA Test, GEDmatch T459025[compare], yourDNAportal ATHcfd541e0
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MyHeritage DNA, GEDmatch T459025[compare], yourDNAportal ATHcfd541e0
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Living DNA, GEDmatch T459025[compare], yourDNAportal ATHcfd541e0