BRIAN PENDLETON AND HIS DESCENDANTS, 1599-1910, Compiled by Everett HallPendleton, Privatley Printed MCMX, found in the DAR Library, Washington,DC. Page 1-77
As she was forty-eight years old and still single when she signedreceipt for her share of her father's estate in 1750, she probably diedunmarried.

Sources: Early New England Pendletons.
Early: Mary Pendleton, still unmarried in 1777.