I would take the path of least resistance and let her know you received her reply, that you were sorry she had concerns, and that you would be happy to work with her to resolve the issue. I would explain to her that the chip was a natural part of the work itself, and that if she is dissatisfied for any reason, refer to your store policies for resolution. If the chip is part of the design, I wouldn't offer a repair/refund. If she wants it "fixed," I would have her pay for shipping etc. and offer to "repair" the item. If she wants a refund, then it's up to you and your store policies to determine that outcome. Bottom line, if it's not your fault and she wants the item but "fixed," she pays for it. If she wants a refund, then refer to your refund policy, and smile...the customer's always right, right??? Eh....I feel your pain.