Her character is called MELLIE LOGAN !
And here i've found some infos for the casting of the little girl, it gives us more info about the general plot, looks interesting!!!:
[SADIE LOGAN]9-12 to play 10. Caucasian. The feisty daughter of Jimmy Logan (Channing Tatum) and
Bobbie Jo Logan Chapman, she lives with her mother (Katie Holmes) and her stepfather Moody and her twin half-brothers
Dylan and Levi in West Virginia. An aspiring beauty pageant winner like her mom, she is prepping herself for a major pageant, the Little Miss West Virginia Pageant...
[DYLAN & LEVI CHAPMAN]Identical twins, 5 - 6 years old, Caucasian. They are the rambunctious children of Moody and Bobbie Jo Chapman...
STORY LINE: The Logans are a hardscrabble family from the hills of West Virginia, and their clan has been famous for its bad luck for purt' near 90 years now. But the conniving JIMMY LOGAN decides its time to turn the family's luck around, and with a little help from his friends the Redneck Robbers, he plans and executes a Hillbilly Heist of $14 million from the Charlotte Motor Speedway...