It was special effects.
I'm guessing that the Land of Oz was in another dimension over the rainbow, and when Dorothy's house broke through, she saw Miss Gulch's counterpart, the Wicked Witch of the West.
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The story didn't say, but I hope she was for what she tried to do to Dorothy's dog!
Good question! I hope she did because she was really "a wicked old witch!"
Margaret Hamilton played the role of Miss Almira Gulch and the Wicked Witch of the West from the film 'Wizard of Oz' .
Miss Almira Gulch rightly was wary for having been bittenby Dorothy Gale's pet dog Toto in the beloved 1939 film version of 'The Wizard of Oz'. The verb 'hate' is emotional. It isn't fair to use that term in regard to Almira Gulch, who is the power holder of the county in which Dorothy Gale and her family live. For example, Miss Gulch comes to talk to Uncle Henry and Aunt Em about Dorothy's and Toto's freewheeling ways. Uncle Henry lets a gate hit Miss Gulch. That is so rude.
He jumped out of her basket on her bicycle on the way to the Sheriff.
Judy Garland in the l939 film. Diana Ross in ( The Wiz) a Gotham-centered all-Black adaptation. By the way Miss Ross is sole surviving player of this production.