I found a short blurb about Isabel Dyer in Descendants of Edward Small of New England and the allied families, with tracings of English ancestry, by Lora Altine Woodbury Underhill. Boston, Houghton Mifflin company, 1934. Vol. 3, Page 1319ff. Accessed 2 July 2017 at HathiTrust. Page 1319 (Beware, there is another edition with different page numbers.) This appears to be a generally well researched book. Hope this helps.
It says that Isabel, the daughter of William Dyer, married twice. First, she married Vincent Roberts, int. 1744/5. He died and she married John Fickett, int Dec 1749. John died at age 98. Supposedly, Isabel and John may have had 10 children, but only 3 were known to the author: Benjamin, John and William.
I did find an error: there was John Sr. and John Ficket, Jr. Sr. died in 1823, while Jr. did in 1828.(DAR. GRS John Fickett, Sr.) The DAR shows the following children for John Fickett Sr. and Isabel Dyer Roberts:
- John Jr.
Although I can't find anything with a birth or death date for Vincent Roberts' and Isabel's son Vinson, I believe that he is the one who married Susannah York, and that the children born in the 1770s+ are children of Vinson, the son, not Vincent the father. Stackpole really isn't the best source, but you can see what he says in ''The History of Durham," (Stackpole, Everett S., ''The History of Durham," Press of Lewiston Journal Co., Lewiston, ME: 1899. Accessed on 2 July 2017 at Archive.org.). Page 245.