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The Medium doesn’t want to show the children their own planet because she’d rather look at things that are more “delightful.”
A Wrinkle in Time
From the text:
The Medium lost the delighted smile she had worn till then. "Oh, why must you make me look at unpleasant things when there are so many delightful ones to see?"
A Wrinkle in Time/ Chapter 5/ Page 87
The Happy Medium is reluctant to show the children earth because he/she would rather show them more delightful and funny things.