Cordelia's Honor, by Lois McMaster BujoldRead about another entry on the list.
Being a badass isn’t all gun battles and beheadings (well, sometimes—spoilers!). Playing politics is also key. Cordelia Naismith is the only Betan on the colony world of the Barrayarans. Where the Betans favor liberal social policies and egalitarianism, the Barrayarans are feudal, warlike, and paternalistic. Which makes things awkward for Cordelia’s marriage to Count Aral Vorkosigan, prime minister of Barrayar. Cordelia manages to thrive in a society that counts her as less than a person, almost single-handedly putting a stop to a backwards revolt and giving no quarter when the life of her unborn child is threatened.
Cordelia's Honor is among Thea James's eight best women in military science fiction.