"I knoooow how to ride a carousel, silly." Still, she beams at him because he's actually looking out for her. "If you think I need to hold on tightly for this kind of ride, I should take you to one of the roller coasters. You need to be bigger, first."

That's one of the benefits about being who she is. She can make herself bigger to go on the bigger-people's rides. Charles might be older, but he can't do that.