im sat here in tears as dd behaviour is getting me down, she has picked up the worse attitude from one of her closest friends which is making her very argumentive, answering back, stubborn, stroppy and selfish, she keeps being horrible to my ds whos 4 and now starting to pick up her bad behaviour, i have tried everything talking to her, sending her to her room, grounding her, taking toys away, banning treats and now i just dont know what to do, any advice will be greatly recieved,