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 (Dickenson,)(Dresser), Phips 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.
