The Real Abigail

However, given the use of the word "legend," this may very well be false.

“The legend has it that Abigail turned up later as a prostitute in Boston.”

The Real Abigail Williams

Another reference (A brief historical note at the end of the Crucible, by Arthur Miller) says that

In addition, John Proctor was 60-years-old during the time of the Salem witch trials. Abigail being only 11-years-old suggests that no real affair happened between the two and was created purely for dramatical purposes.