Abigail has also been identified as Abigail Bacon, daughter of Nathaniel Bacon.
cos1776 Response: Tyler3 mentions that Nathaniel Bacon did leave Abigail his estate, but he states that it was because he had no children of his own and that Abigail was his niece. He does not say who her parents were.
... As he [ Nathaniel Bacon ] had no children he bequeathed his estate to his niece Abigail Smith, who married Major Lewis Burwell, of Gloucester county, and has many descendants in Virginia and the south.