My princess is damn stubborn about anything ...and if I scold her, her grandmom and granddad scold me..what should I do??

What I have realised in my parenting experience is that kids understand logic better than scolding. Rather than scolding her, make her understand nicely. Sit and talk to her and make her understand that what you have in mind. Let her also have a say while you discuss it with her. Try this.