What was the real reason that Kelly got angry with Edward when he called his parents so often during their trip to New England?

Five months after Claire was born, Kelly and Edward left the kids with Mary and George and stayed a few nights in a New England bed and breakfast and a night in New Haven where Yale, Edward's alma mater, was located. Kelly picked a fight with Edward about his calling home to his parents so often. In the end, she admitted to herself that she was jealous of the way his parents always supported whatever he did and didn't interfere in his life.