A.P.
There is a school of thought that says that children in part become who we tell them they are--so you might try going out of your way to notice other things about your daughter--or to redefine her attitude in a new way. If she thinks of herself as a kid "born" with an attitude then she has every reason to believe that doesn't need to change her behavior because she was born that way. You might try giving her a new definition of herself--what other role does she play in the family--and focus on that rather than on her attitude. It's worth a shot if you've tried everything else. Good luck!