Just to beat a dead horse, Eva Peron for Argentina. Nur Jahan would be a decent choice for the Mughals; not the best choice, but I would put her in my top three leaders for them. Nubia has a few good options, though I'm only familiar with Amanirenas. I think people have said the Ukraine/Kievan Rus has some decent options, like Olga, but I feel like there are others. Another name I forget is the leader of the Mississippians, but she sounds like one of the only options, so that's good. If they really wanted to push it, the could have Wilma Mankiller for the Cherokee, but that would be a bit much. I don't know of any others, but I'm sure they're there.