How does the author connect the weather to the mood in the novel, Magic for Marigold?

On several occasions throughout the book, descriptions of the weather in narration echo Marigold's feelings and / or state of mind. When there's conflict, the weather is stormy and unpredictable. When she's happy, the weather is clear, calm, and fine. Does the weather trigger the mood? Possibly, but it's more likely that the author is using the weather as a metaphoric representation not only of Marigold's inner life, but of her connection with nature in general.