…in a position to be critical about their visiting-lists; she had discussed the perils of divorce with her rector, and had felt thankful at times that Lily was still unmarried; but the idea that any scandal could attach to a young girl’s name, above all that it could be lightly coupled with that of a married man, was so new to her that she was as much aghast as if she had been accused of leaving her carpets down all summer, or of violating any of the other cardinal laws of housekeeping.
There are no more uses of "aghast" in the book.
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She stepped back aghast at the behavior.
Her employer looked aghast and fired her on the spot.