Certainly she is making fun of the good people of Meryton when she describes the way that Darcy's popularity waxes and wanes so rapidly at that first ball, but that's no proof that their report isn't accurate. The first report about Bingley's wealth, which Mrs. Bennet quotes in the very first chapter, before he's even arrived in town, proves to be accurate. If either Wickham or the townspeople had given a different number from the other, then I think that would definitely be a clue that we aren't supposed to regard either of them as reliable. But the fact that they both gave the same number seems rather confirmation of the opposite.
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