[Margaret Pilkington]

I think it is a bit unfair to say she is adept at changing her mind.
Sometimes in life you have to adjust your course because circumstances change(or your perception of the circumstances change...you have more/better information). To remain on the same course without taking into account of circumstances is foolhardy, stubborn and sometimes it is dangerous. As the Captain of the Titanic would tell you...if he could, that is.