I believe you are referring to two different Sarah's. I have Sarah Jacob, born abt 1737, married to Richard Gaither with the same parents as you list. This Sarah was my gggggrandmother and gave birth to eight children, the first being Eli b. ca.1763 (my ggggrandfather) and the last was Jeremiah b. 20 Oct 1783. I also have Sarah's husband, Richard d.abt 1826, with no mention of a divorce.