Born in Canada, married Bernhard Emmerich aka Emery about 1790
FAG Lists the city of birth as Elizabethtown, Ontario, Canada 1770
Canada, Find A Grave Index, 1600's-present
Global, Find A Grave Index for Burials at Sea and other Select Burial Locations, 1300s-Current
MyHeritage smart match with Racz lists place of birth as Brockville, Leeds, Ontario, Canada.
Find A Grave, database and images (https://www.findagrave.com : accessed 14 September 2018), memorial page for Mary Elliot Emery (1770–9 Jun 1815), Find A Grave: Memorial #97016288 ; Maintained by Emery 1959 (contributor 47885467) Unknown.
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 DNA with Mary: