The problem with Borogravia (as far as I can tell from the book) is that (I can't give you a cite at the moment--and it's late) the country had no real ruler since the death of the husband of the Duchess years ago. Like Queen Victoria, she has gone into seclusion and left things in the hands of the men of Borogravia. It is not at all clear that even had she not chosen to do so, her word would have carried any weight in terms of the management of the country.
The women in Borogravia are in a terribly subservient position -- they have no right of inheritance. If they misbehave they can be sent to institutions like that where Wazzer, Lofty and Tonker were held. They must wear head coverings, they have no real say in the way things are done.
So the Women of this group, with the aid of socks, go off for their own various reason, as soldiers pretending to be men. But they (like the commanding officers at the fort) find that they are in great danger of beginning to think like men--all full of testosterone, which appears to inhibit brain function.
When Polly goes back into the army (when her country needs to defend itself later) she goes back as a woman, not as a man.
It's quite late, and I'm tired, but this gives you some idea of what I'm talking about. And think about some of the women who have been Presidents or Prime Ministers of various countries (Israel, India, for example). They have, on the whole, shown a great deal of intelligence and capability in dealing with the problems of their countries.