If a customer stops payment on an item she is expressly acknowledging that she ordered the payment. That's not the situation you are facing.
While your customer's frustration is understandable, it is not a paramount consideration. She will need to execute an affidavit for each item if she wants you to return them. If she wants to assure that there will be no more, she needs to acknowledge the fact that her account has been compromised, close it, and open another.
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In this world you must be oh so smart or oh so pleasant. Well, for years I was smart. I recommend pleasant.