well she was just made a princess in my story "The Magic of Love and Family" and just appeared as an Alicorn when Twilight gave birth to her son who is about to be named in the next chapter of the final three chapter story "A Royal Colt Story" Twilight's son name is Prince Dream Magic and Sunset's official title is Ambassador of Equestria and Emissary of Friendship meaning basically she does Twilight's job in the Human World and is suppose to keep communaciton between the Human World and Pony World open and go back and forth occusionally to ensure friendship is kept between both worlds.