Margot has two strikes against her: first, she is different from the other children, and, second, she has something they don't: she can remember having seen the sun.
She can describe the sun. For example, she says it looks like a copper penny in the sky. This incites the jealously of the other children. Children like William bully her because they want what she has.
Margot also differs temperamentally from the other children. She has a sensitive, artistic disposition. She doesn't join the other children in their games in the tunnels. She is depressed about being on Venus and rejects life there. In doing so, she rejects the other children. They, in turn, reject her.
Another child might have buried her pain and tried harder to fit in, but that is not who Margot is.
The point—or a point—of the story is that groups are cruel to those they perceive as different from themselves. There is a malicious mob mentality lurking in people's souls that makes them want to crush other people's...
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