MADISON, Miss. — Elizabeth Dampier doesn’t get the royal treatment at home, even though the fifth-grader plays a princess-to-be on the big screen.The 10-year-old Mississippi girl is the voice of young Tiana, the female title character in the new Disney animated movie, "The Princess and the Frog,” opening nationwide this weekend.Elizabeth does chores, sings in a Baptist church choir, makes snacks for her three younger siblings and is a straight-A student in a family of high achievers.