She stood talking with her cousin and Miss Van Osburgh, till a slight cloud on the latter’s brow advised her that even cousinly amenities were subject to suspicion, and Miss Bart, mindful of the necessity of not exciting enmities at this crucial point of her career, dropped aside while the happy couple proceeded toward the tea-table.
Mrs. Fisher was not a woman who talked of herself without cause, and the practice of direct speech, far from precluding in her an occasional resort to circuitous methods, served rather, at crucial moments, the purpose of the juggler’s chatter while he shifts the contents of his sleeves.
There are no more uses of "crucial" in the book.
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Doing well on the SAT is crucial to getting into the college I want to attend.
The information is crucial to making a good decision.