Behavior after seeing Grandma

2 years ago we moved closer to Grama after my kid started asking for her. Now 4.5 she goes to gramas house one day a week when not in school. We noticed pretty quickly that on nights after Gramas, she can’t sleep. Bedtime is later by at least an hour and is sometimes accompanied with crying, tantrums, whining etc.

Very much aware that this behavior is normal at this age. It’s just that I can’t tie it to anything. Ex) kid asks for matches to play with, mom says no, tantrum ensues.

Could it be that Gramas parenting is vastly different than ours? We encourage independence, authoritarian style, less sugar. She’s a Grama I know it’s not like that over there. Just wondering if this could be a change that’s making the kid wig out.

I’m just about over it and ready to make a change.