Bratty, annoying, unlovable stepdaughter. what should i do?

OOOOOOOOOOH GIRL DO I KNOW WHAT YOU MEAN. MY FIANCES DAUGHTER DROVE ME UP THE WALL WHEN SHE WAS DOWN HERE LAST SUMMER. SHE WAS SOOO BAD AND NEVER LISTENED. ALL THOUGH SHE WAS 5, SHE WAS VERY SNEAKY AND KANIVING. AND HAD WEIRD UAL BEHAVIOR. I DID NOT WANT HER AROUND MY DAUGHTER AT ALL. I REALLY COULDN'T STAND THIS KID, AND I TRIED MY HARDEST TO HELP HER BUT SHE WAS SUCH A LITTLE BACK STABBER. I JUST THREATEN TO LEAVE IF SHE COMES BACK.