Back in days of old, Kings and Queens were the mothers and fathers of the "people" first before thier own. Therefore if killing their own was what was needed to be done in order for their culture to survive and thrive then that is what they would do. I'm not saying I think it was okay for her to do that, but at the same time, she did leave her country with good deeds even if it meant sending herself to never ending search of Nirvahna.