I think you need to figure out who Sarah really was first. It looks like the Sarah Morrill and husband William Smith of York, Maine were born, lived, and died there, not in Georgia.
Found in the following book (available on Ancestry)
A Record of the Services of the Commissioned Officers and Enlisted Men of Kittery and Eliot, Maine, Who Served Their Country on Land and Sea in the American Revolution, From 1775 to 1783. Boston, Massachusetts: A. Mudge & Son, Printers, 1992.
SMITH, WILLIAM, Private
Enlisted or drafted, June 1, 1778 for nine months' service in the Continental Army for the town and a resident; was seventeen years old, five feet five inches tall, and belonged to the fourth company of the Twelfth Massachusetts Continental Infantry. Enlisted or drafted, April 29, 1780, and served as a private in Capt.. T Bragdon's company of Lieut.-Col. J. Prime's battalion of Massachusetts State Troops. Discharged, Dec. 5, 1789,
Lived in upper part of Second Parish in 1782 and 1786. Married Sarah Morrill, Feb. 11, 1784 at Kittery, and both were residents. Living in Eliot, July 4, 1820, aged sixty-six years, wife, Eunice, forty-six years old. Owned no land. A pensioner of Eliot, commenced April 1, 1818 , at ninety-six dollars a year for service as private in the Massachusetts Line, and it was continued until his death, in April, 1828, in York County, aged seventy-four years.
Other information available, census records, etc.