Wife of Rev. Samuel Dudley, m. abt. 1651

I am looking for the surname of Elizabeth, the third wife of Reverand Samuel Dudley of Exeter NH. I have seen this recorded as Legat, Legatt, Lidgett, Leavitt, even Smith and Hilton, but I have cause to doubt the validity of most of these sources.I'm interested in a positive reference but will entertain inetersting speculation.