i found my ancestor polly listed on page 532 of "history of charlestown new hampshire - the old no. 4", in a listing for oliver putnam. his wife catherine dunsmoor's parents were noted as "john & polly (sartell) dunsmoor".
then in another book i see polly listed in a book on the history of the dunsmoor family (i have misplaced the link to that book) in a listing for john dunsmoor as "he married polly sartell, daughter of nathaniel sartell of groton massachusettes."
i do not have dates for polly or her father nathaniel, but i do know polly's daughter catherine dunsmoor was born 1806, in new hampshire.
i have seen a nathaniel sartell in other books & documents, but with the last name spelled differently, & with no mention of a daughter named polly. i don't know if polly was just a nickname either.
if you have any information, i would appreciate it. thanks.