If you have children, this scene will look very familiar. When a young toddler reaches the point of exhaustion, they completely shut down. It doesn't matter where they are, or what they're doing. They go out like a light, and that's it.
What worries us about this picture is that there's no sign of a parent anywhere in the shot. We hope someone eventually came back for her; she could get trodden on, and that would make her even grumpier than she probably already is.