D.W.
Don't let it get to you. It's your job to set rules, and her job to resist them. Unfortunately, Grandparents get to play the good guys. That does not mean your daughter loves you any less, but she has to understand that this is your job as a parent, and that those same loving grandparents that spoil her did their job when you were young not spoiling you. I have a 7 year old daughter, as well, as they seem destined to push against mommy. Mine flips between thinking I'm the best mommy in the world, and hating me. It's all normal. I just remind her that my job is to help her grow up to be the best her possible, and sometimes that means enforcing rules she doesn't like at the moment. And when she insists she doesn't love me, I just say, "mad at me right now, eh? we'll see how you feel tomorrow. And I still love you no matter what you say."