Ivory Dickinson - Who is she?

In looking through Rowley and Ipswich (Mass.) VR, I do not see any record for Ivory Dickinson from any parents at all.

For James Dickinson and Rebecca Dickinson - Dresser she is not in the list of their children found in "Genealogical and Personal Memoirs: Relating to the Families of Boston and Eastern Massachusetts," page 321. (link - https://books.google.com/books?id=OU0k2d8nl3IC&lpg=PA321&ots=iFEsI1yFym&dq=Elizabeth%20(Platts)%20Dickinson&pg=PA321#v=onepage&q=Elizabeth%20(Platts)%20Dickinson&f=false)

There is a tree match to Ivory Dickinson But the father is a shell.

Unfortunately, non of the managers involved, including the curator, are very active.