Genealogy of the Pelton Family of America (
https://archive.org/details/genealogyofpelto00pelt ) page 59 says that John Pelton Jr. was married 1756 (at Saybrook) to his second wife Martha Shipman "of Chester", Connecticut. They named their first son Joseph and also had a daughter Priscilla, so the best match seems to be Martha Shipman (daughter of Joseph and sister of Priscilla) of Chester. She is Shipman-381.
However, Shipman-32 makes her daughter of Abraham Shipman and Ruth Butler. She was born in Saybrook, not Chester, so is not such a good match. So is The Pelton Family of America correct that it was Martha Shipman of Chester (even though they give her father's name as John instead of Joseph)? In any case, Martha married 2nd to Joseph Bishop.
P.S. The youngest child of John Pelton Jr. and Martha Shipman was born in 1779. This would have been when Martha Shipman (of Joseph) was 44 years old. Martha Shipman (of Abraham) would have been 56 years old, so that is another argument against Shipman-32.