I don't know if it's the same in the US as it is in Canada, but I have used a few different credit card processors, including Square. Here in Canada, how chargebacks work is, someone pays you by credit card, they are unhappy for any reason, call the card issuer and complain, the charge gets reversed, your cc processor is notified, you then get the payment taken back from wherever it normally goes and get notified of the reversal. From there, you have to prove they got what they paid for to get it "unreversed". One problem is, I heard that with Square, if you get a chargeback, they start holding some of your money for backup.
In business, chargebacks = headaches.
In my opinion, keep what you were paid, forget the rest, and move on. Make sure you have enough in the bank account for a refund though in case she does do it. If you don't, you lose that money + NSF fees from both ends.
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