Her continual disagreements with her mother, her rash squabbles with Tom and Charles, and petulance with Betsey, were at least so distressing to Fanny that, though admitting they were by no means without provocation, she feared the disposition that could push them to such length must be far from amiable, and from affording any repose to herself.
There are no more uses of "petulant" in the book.
Show samples from other sources
She stomped her foot like a petulant child.
She is petulant by nature and was clearly insulted by the question.