Of course, according to the East African translation, it would naturally still be referred to as a princess, after all, being empires, the East African Government would not think that a Russian princess is superior in status to a princess of the Rhein Royal Family.
Leaving aside the Rhein Empire, the Rhein Royal Family itself is a branch of the Hohenzollern Family, so even by European standards, its status couldn't be considered low.
Of course, it's inevitable that European countries might be indifferent to the East African Empire situated in Africa, as every country judges others based on its national standpoint.
This is typical, like Vietnam, a former vassal state of the Far East Empire, which, in the eyes of the Far East Empire, the ruler of Vietnam is at most a vassal king, which does not prevent Vietnam from claiming the title of emperor.
