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

definitely talk to them and tell them that as a mother your child needs to respect you, by this behavior they are teaching her otherwise and you do not appreciate it. tell them that you know they love her but it is also important that she has the right values and manners, so that even outsiders love and respect her as she grows up