ICANFLY you are absolutely right about her tender age and innocence. Being the only 'so-called' Hindu nation of the world we can't abolish the kumari pratha right away but why don't we set the age limit to choose the kumari, let's say 6 or 7 or 8 until menstruation.
Although there's a superstition that kumari's hasband is doomed to die within sixth months of marriage, Kumaris are allowed to get married. Former kumaris have married except the younger ones.