Winning the Bedtime Battle with granddaughter?

You might want to try to put her to bed earlier. Sometimes when kids are over tired they get really hyper. i would also talk to her about it and come up with a compromise with her. Have a reward system for so many nights of going to bed nicely and getting up in the morning she get a treat or points toward a toy. You could also make a game out of going to bed and brushing teeth. Whatever you do you should ask her how she thinks you should solve the problem, if she feels like she's a part of it she might be more willing to co-operate.