Abigail was the second wife of John Graham (Browning, Charles. Americans of royal descent, 7th ed. Baltimore : Genealogical Pub. Co. 1969, pg. 69).
from findagrave.com:
Abigail was born to the Rev Issac and Sarah Blackleach Chauncey.
Abigail was the second wife of Rev John Grahman Sr. They were married for 48 years and raised seven children.
Little is known of her final years even the exact day of her death. She lies next to her husband John Graham,in White Oak Cemetery, with no stone to mark her final resting place. Dying in the midst of the American Revolution, money for grave markers was scarce.