In A Wrinkle in Time by Madeline L'engle, how is Meg impatient?

Meg reveals
her impatience early in the novel when she tackles a boy from school who calls Charles Wallace
"dumb" and gets a black eye as a result of her efforts. But it is on Camazotz that her
impatience shows itself most fully. She doesn't want to linger when they arrive. She wants to
get straight to her father and save him.

She is...