Could be: Mary Elizabeth Austin
The Printed Records of the Synod of Philadelphia, page 173, gives an account of the Tithables at Caldwell Settlement, showing the sons of Thomas, Sr.,[ m 1748] as follows:
a]Thomas Vernon, Jr..
b] Isaac
c]James (He married Eleanor)
d]Thomas, Jr.
e]Jonathan
f]perhaps-another son, RICHARD > VERNON