Yes, shari, if Eva Braun hadn't had had 'a headache' Hitler would never have annexed the Sudetenland ! (I assume they were together then; more research needed. I sense a PhD coming up) Of course, what you say is true, but it's rather difficult to identify anyone female who was a true eminence grise. It is natural for feminists and egalitarians to look for such figures, and tempting to exaggerate the contributions of any. Their best hope is to look at a thinker like Mary Wollstonecraft or Mary Stopes as a pioneer of contraception, women who had an influence on social history.
This playing up of comparatively minor women in history is a worthy attempt to give girls more self-esteem, by saying that women have always been overlooked or underrated and they should not be trapped in the same thinking that created that state of affairs . The same applies to black figures in our history. Mary Seacole falls into both categories, even though her contribution was widely accepted and she was feted in her own time, the feeling is that she was ignored far too much or altogether.