her father rules wutai in the english version of the game the people in the pagoda call her miss yuffie but i'd be willing to bet they originally called her yuffie sama be nice if someone could source that but hey while it's still not yuffie hime i think it's pretty obvious she's considered royalty of some sort personally i think the whole well no one ever outright calls her princess or godai king emperor etc to be rather silly godai rules over the single town we see of wutai to say that he's not an emperor or whatever and thus yuffie a princess just because it's never stated in those exact terms would be like saying that shinra actually has little power outside of some manufacturing energy production and hiring out guards even though it's pretty plain to anyone that's played the game that they run everything