She married Benjamin Foss b. Jan 1742 in Scarboro, Me. Married him 7 Nov 1762 She is listed as Sarah Mitchel (records, 2nd congregational church,scarborough, maine. vol 4, pg 320) (available online). All other records show her as a Getchell. She is listed as his 1st spouse in the DAR Patriot Index pg 1062 and also in "Memorial of the Centennial Anniversary of the Settlement of Machias" pg 162.
Most of the records I have list her as a "Getchell".
She & her husband moved to Machias, Maine as part of the group that founded the town in the 1760's. She had 11 children & died abt. 1800 in Machias, Me. Benjamin then married Hannah Miller 28 Sept 1800 in Machias (Machias VR)& had another 8 kids. ref. "Memorial of the Centennial Anniversary of the Settlement of Machias". Also Drisko's Narrative of the Town of Machias, pg 425.
Obviously the Sarah that you are referring to is not the one I am seeking.