Mary Ann seems confused about her 'word' to Gilligan. I missed the first hour but I'm guessing she stuck to that alliance to boot the Skipper even tho that was a bad move on her part. Mr. Millionaire says to Gilligan, 'shouldn't someone be able to make up their own mind?' WHILE he is trying to brainwash Mary Ann himself.
ETA: Gilligan really picked the Wrong partner when chosing Mary Ann. He was obviously thinking w/the wrong head.