Chris, Mary Hunt's profile is a little messed up. I have added her marriage data, with an additional source. There are several entries for a "Dorothy Kimball." It is possible that Dorothy is Mary's sister, but I am not at all certain at this point.
The familysearch family tree for Mary names her parents as Ephraim Kimball and Mary Whittier (without sources, as you mentioned). I find a Mary Kimball, daughter of Ephraim, Jr., baptized of in Bradford 12 November 1732. Again, at this point, we cannot assume that this is our Mary. We can posit Ephraim & Mary (they have profiles) as possible parents in the biography, but I do not believe we should go as far as creating profiles for them and linking Mary to them. Indeed, their profiles have a daughter Mary born in 1727 in Boxford Ma attributed to them (and Boxford VR does have that record.)
One problem is that there is a boatload of Mary Kimballs born in Essex County who could have been our Mary. At this time I don't believe we have enough data to decide which one is ours..