My daughter who just turned 5 years old is getting more and more disrespectful. She is a very independant, outgoing, intelligent little girl. Lately she has become more challenging. She is doing what she wants (and when she wants), she speaks to me the way she chooses, and when I try to discipline her it's to no avail. She will yell at me, saying "NO!" I have tried time out, nose in the corner, taking things away, going to her room, rewards for good behavior (which only made her want a toy EVERYTIME we go to a store), making her aware of her brothers behavior (he is a very responsible 7 year old), etc. Does anyone have any advice as to what my other options are?