I'd also like to learn who Oliver Hartwell's wife really was. Am somewhat confused by your message. I don't know anything about Mary Adams work on the Hartwell Family. I'm the "official" genealogist for the Hartwells of America. Also, the update to Lyman Densmore's work was done by John F. Hartwell, as Densmore was deceased by that time. (Densmore made a lot of mistakes that were continued by John F., as John didn't seem to ever check Densmore's work, but took it for gospel!).
My personal opinion is that Catherine is the daughter of Henry and Catherine Soloday Shryock, but I have no actual proof of this theory, which would be nice.