The story of the girl and the windmill

A girl held a windmill in her hand. She blew and the windmill turned with glee.

A moment later, the windmill was stuck into the ground. The windmill turned with the natural breeze.

When would the girl know it is time to put the windmill down on the ground? Or how does she really know how when the wind will come? It’s so difficult. The wind is unpredictable.

I wonder.