Why does the Witch of the North send Dorothy to the Emerald City?

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Illustration by W.W. Denslow showing Dorothy comforting the Cowardly Lion on a yellow brick road, with Toto, the Tin Woodsman, and the Scarecrow nearby in a forest. — The Wonderful Wizard of Oz An illustrated page by W.W. Denslow in L. Frank Baum's *The Wonderful Wizard of Oz*.

In L. Frank Baum’s The Wonderful Wizard of Oz, the Witch of the North advises Dorothy to travel to the Emerald City because she believes the Great Wizard Oz may be able to help the young girl return to her home in Kansas.1