I believe that Martha "Polly" Mathis Mathews b. about was the daughter of Francis Mathews a Loyalist from NH. She and husband Jon Low lived on Campobello at least until 03 May 1804 when their daughter, Susan, was born. Susan married Stinson Peabody in Dixmont Maine as per the Peabody Genealogy. You will find John and Martha living in Dixmont in the 1850 Census. John Low was the son of Jonathan Low and Susanna Gooch as per the DAR application of their gg granddaughter, Addie Webb Rosenbluth: Lineage book By Daughters of the American Revolution VOL XXXVII36001-37000 yr 1901 pub Washington DC 1913
MRS. ADDIE E. ROSENBLUTH. 36614 Born in Veazie, Maine. Wife of Edward S. Rosenbluth. Descendant of Jonathan Low, of Maine. Daughter of James B. Webb and Hannah E. Peabody, his wife. Granddaughter of Stinson Peabody and Susan Low, his wife. Gr.-granddaughter of John Low and Martha Mathews, his wife. Gr.-gr.-granddaughter of Jonathan Low and Sally Googe, his wife. Jonathan Low enlisted 1775 in Capt. Samuel Sawyer's company, Scammon's regiment. In 1818, at the age of sixty-six he was allowed a pension in York county, Me., for one years actual service as private, Massachusetts line.