Elizabeth Sloan
Birth Dec 1738
Death 12 Sep 1784 (aged 45)
Burial
Old Hanover Presbyterian Churchyard
Grantville, Dauphin County, Pennsylvania, USA
Elizabeth (maiden name unknown) was the wife of Alexander Sloan and shares the marker with him. She died on 12 Sep 1784, at 45 years and 9 months, so she was born in about Dec 1738. She was not included in the source which lists her husband below.
Using the 2006 photo, I believe this shared gravestone says:
In
memory of
ALEXANDER SLOAN
who departed this Life
June 18th 1812
Aged 77 Years & 3 months
Also of
ELIZABETH, Wife of
Alexander Sloan
who departed this Life
September 12th 1784
Aged 45 Years
and 9 months
Her husband, Alexander was born 1785 and died 11 (sic) Jan (sic) 1812. The Historical Society of Old Hanover Church, by Rev. Thomas H. Robinson, D.D., published in 1878 by the Historical Society of Dauphin County, page 35. The stone clearly says Alexander died 18 Jun, not 11 Jan.
https://www.findagrave.com/memorial/16122913/elizabeth-sloan