Mary, born 21 March 1752, married John Ker [sic] of Killingly
I cannot locate a death or burial record for her. She may have remarried after the death of her husband John Dixon who passed away in 1759.
A record in Find A Grave identifies her gravesite with her maiden name on it: Janet Kennedy. There is nothing in the burial record that indicates that the woman who was buried there was actually the Janet Kennedy Dixon of this profile. In fact, the surname Dixon does not appear on the gravestone. Until there is proof that this is the same woman, I removed the death date of 1796 associated with that record.
Her daughter, Mary Dixon Kies, was the first woman in America to apply for and recieve a patent.
Connecticut Church Records, Ancestry.com. Connecticut, Church Record Abstracts, 1630-1920 [database on-line]. Provo, UT, USA: 2013. Original data: Connecticut. Church Records Index. Connecticut State Library, Hartford, Connecticut. See: https://tinyurl.com/y6vxwjrw.
Early Connecticut Marriages, Ancestry.com. Early Connecticut Marriages [database on-line]. Provo, UT, USA: Ancestry.com Operations, Inc., 2012. Original data: Bailey, Frederic W. Early Connecticut Marriages as Found on Ancient Church Records Prior to 1800. Baltimore, MD: Genealogical Publishing Co., 1997. See https://tinyurl.com/yb2f3cpf.
Treat, John Harvey, Ancestry of Col. John Harvey, of Northwood, New Hampshire, The Harvey book: giving the genealogies of certain branches of the American families of Harvey, et al., published in Boston, Massachusetts, 1907.