Good for Maggie. She boldly went where no woman had gone before. She believed that a woman can do or be anything she wants to be - a definition of a feminist, whatever she was labelled as.
Sometimes for a woman doing or being what you want involves changing something drastically so that your path to fulfilment is not blocked by a anti-female law promulgated by those who believe that a woman's place is in the kitchen, nursery, drawingroom or bedroom, but not in the higher ranks of church, law, medecine, government. Who allowed a husband to own all of his wife's money, and do with it what he wished, and if the marriage failed, to keep custody of her children so that she never saw them again. Who grudgingly allowed women to attend University lectures, but behind screens so that the real students were not distracted, and without being awarded degrees, and who barred female medical students from anatomy lectures.
To do that a certain amount of chutzpah is necessary, and a lot of single-minded determination not to be side-tracked into a different destiny which does not transgress conventions.
It also helps to be born into a country/religion/society where the spadework has already been done by the pioneers. Those who have made it possible for women to be consecrated as bishops are among those pioneers.
As men cannot carry and bear babies, there will always be a tendency to slip back into a society where women generally have lesser or temporary work, with corresponding lower pay and self-esteem. women are more free than they have been for centuries - not complacency and "I made it OK so there is no problem" but "the price of freedom is eternal vigilance"
(a simplified variant of a line from a 1790 speech by Irish orator John Philpot Curran: "The condition upon which God hath given liberty to man is eternal vigilance; which condition if he break, servitude is at once the consequence of his crime and the punishment of his guilt".)