…and that one of these other vus would explain succinctly the bafing phenomenon of which he had been both a witness and a part; it was even possible that none of what he thought had taken place, really had taken place, that he was dealing with an aberration of memory rather than of perception, that he never really had thought he had seen, that his impression now that he once had thought so was merely the illusion of an illusion, and that he was only now imagining that he had ever once…
There are no more uses of "aberration" in the book.
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The outburst was an aberration, out of keeping with her character.
At that moment she cannot have been in her right mind; yet, what was the cause of her temporary aberration I cannot say.