My 7 year old acts like she's 17!!!!?

i might of misinterpreted this, but did you happen to buy her lots of toys? buying things for your kids is good to do every once in a blue moon but if u do too much theyll become spoiled and essentially start acting like they r the boss of u. she pretty much has no respect for her parents because they cave, u have to be stern and stick to ur sentencing, if u think your being a little bit tough then thats good. Dont second guess yourself