Stuck up Brat! --GRRRRRR---?

You probably need to let her learn some lessons..... Unfortunately she thinks she knows everything, no one can tell her anything. I have a daughter with the same attitude. As her mom I had to step back and let her have a few hard knocks..... It was honestly the best thing I could have done for her. She is finally figuring out that she is not the only one on the planet. It's good that you are trying to take care of her.... I applaud you for being a good big brother.