Abigail used to ride with the members of the Van Der Linde Gang: Dutch van der Linde, Bill Williamson, Javier Escuella, and of course, John Marston. She was a prostitute and often slept with all of the members of the gang. She ultimately fell in love with John and became pregnant with his child, Jack. Abigail and John then sought protection for their son; Abigail, no longer a "whore", becomes a married woman faithful to her husband.
In 1906, John is gravely wounded in a botched bank robbery and left to die by the other members of the gang. John recovers and, seeing it as an opportunity to leave the gang and create a better life for his family, flees with Abigail and Jack. John purchases a farm on Beecher's Hope in West Elizabeth in the northern Great Plains, hoping to establish a homestead. Unlike her husband (who once described himself as "semi-literate") and son, Abigail cannot read as shown when John receives a letter from Bonnie MacFarlane. She died in 1914 and was buried at Beecher's Hope next to John.