She's very old fashioned. I can almost say with certainty that she never cheated on him. My mother was a beautiful woman. Voted most beautiful in her class, has a very sharp tongue and a little naive. She had suspected it way back then, and tricked him into getting the info because he was in one of his Parkinson's spells. Who knows if she'll get over it, she may not want to take care of him anymore, but I think she'll come around after awhile.