Mary Ann Greene

I am researching a family that has two family links to the Greene name.The first, I believe is a descendant of John Green of Quidnesset.The second is from a different branch.Her name is Mary Ann Greene DOB circa 1834.She married a Pardon Thomas Andrew. I know nothing of her parentage other than she is somehow related to General George Sears Greene and Caleb Greene.Area:Rhode Island.
Any help out there???
Karen