I believe the Sarah you are looking for is Sarah Smith. She was a widow, which gave her the surname Moody. Her parents are Deacon Martin Smith (b. 4-15-1692) and Sarah Wier (b. 4-8-1693). There are spelling variations of the name Wier.
I think Pelatiah and Sarah's son, Pelatiah was born in 1758? He married Mary Ann Gillett (also born 1758).