A Betsy Dewey died in Wales, St. Clair, Michigan, on 1 Sep 1887. According to her death record, her father was Godfrey Nestell. I have to think that she was Samuel Nestle/Nestell's sister because Godfrey Nestle was Samuel's father too (as far as I know). Godfrey died in Wales.in Dec 1859.
I took a look a some of the Family Trees for Godfrey Nestle and found that there are a lot of mistakes and some combined families. Some people have Samuel Nestle's family as Godfrey's
family. Some of the trees list Betsy but most do list her as a child of Godfrey.
I would be interesting to see if Betsy was Benjamin mother or related to him somehow.