Little girl is upset because she can’t stop thinking about waffles
From what the mother says, it sounds like the girl was mainly upset that she couldn’t have waffles for lunch, after she had eaten them for the two previous meals. “Why can’t I just stop dreaming about waffles?”
This made me think of my wife. She loves waffles so much that this could have been her when she was a kid, and will probably be my daughter in a year or two.