There is no mention of Mary in the estate records of her husband, John Briggs. She most likely was deceased before 1744. John's father, William Briggs, Sr. became guardian of their children and petitioned for compensation for their maintenance after John's death.
Mary is also named in the 1718 will of Otter Otterson (relationship not known):
OTTERSON, OTTER. Bristol, Bucks County, Pennsylvania. Tailor.
February 4, 1718. March 4, 1718. D. 108.
Elizabeth (daughter of Clause Johnson), Mary daughter of William
Watson; Jeremiah Langhorn of Middleton.
Executor: Jeremiah Langhorn.
Witnesses: Stoffel Van Land and David Wilson.
Sources
Linn, John B. and Egle, William H., "Record of Pennsylvania Marriages Prior to 1810, Volume 1", (Baltimore: Genealogical Publishing Co., Inc., 1968, 1987), p. 220
"Pennsylvania Probate Records, 1683-1994", digital image, FamilySearch (Online: Intellectual Reserve, Inc., 2010), [Original source: Bucks County (Pennsylvania), Register of Wills, "Orphans' Court records 1683-1776, Vol. A1-A2", p. 151],<https://www.familysearch.org/ark:/61903/3:1:3QS7-L99B-2Z6D>
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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: