The Adeptus Soritas are the military arm of the Imperium's religious bureaucracy. They're an all-female fighting force of zealously fanatical battle nuns armed with powered armor, high-caliber weaponry, and lots of flamethrowers - absolutely nuts when it comes to battling enemies of the Emperor.<br/><br/>The Ordos Familius is one of the Soritas's non-combatant side groups - they act as diplomats and go-betweens in negotiations and such stuff at the top level of political movements and military actions.<br/><br/>In both cases, they would take girls at a very young age into their fortress-monasteries to raise them and indoctrinate them to have single-minded devotion to the Imperial Church. Your character could have grown up under the tutelage of either order, but been rejected for further training or outright thrown out of the order when it became clear to the tutors that she was far more concerned with getting knocked up than performing her holy duties. She wouldn't even have to be a violent person to be an ex-Soritas initiate...having a peaceful/pacifistic nature would make it more likely that they'd want to get rid of her.