Mary was born in 1848. She was the daughter of William Dewey and Eliza Brown. She passed away in 1852.
Sources
Volume II Brown Genealogy, Part 1 Many of the Descendants of Thomas, John, & Eleazer Brown, By Cyrus Henry Brown, 1915, pg. 223
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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: