Your obviously have an error in your posting, since you have Abigail marrying at age 80, some 17 years after her death! But I do have an Abigail Allen, born 18 Oct. 1754, daughter of William and Mary Allen. I am descended from their oldest son, Samuel, b. Dec. 4, 1747. I really don't know anything else about her but my Allen family were Quakers who settled in Bucks County, PA, and apparently had close associations with New Jersey Quaker meetings. Two generations later the Allens were in Philadelphia, but some of my records seem to indicate they were in New Jersey during some of the intervening years.
Unfortunately Allen is a common name and it's difficult to be sure you have the right person. Hope this helps.
Unfortunately Allen is a common name and it's difficult to be sure you have the right person. Hope this helps.Eloise