<<I have a marriage for to George Bartlett 2 Dec 1791 in Sturminster Marshall which describes her as "of this parish" and also a possible burial record for her in the same village in 1831 which gives the approximate birth year but I've not been able to find a baptism.>>
I have the Dean family in my tree, William Dean married Keziah Boyt who is in my husband's tree.
James Dean born 1764 is a brother to the above William. James marries Hannah Heyes 13 November 1787 in Sturminster Marshall & James dies & is buried at Sturminster Marshall in 1790; James and Hannah had a son, John, born 1788. I haven't been able to find any other children for James & Hannah. It is possible that this is Hannah Dean, widow of James who marries George Bartlett in 1791.