oh!! I would have been more than angry! The week before Christmas too!! that is just so inconsiderate, I hope you told her so as well.
It happened to me about 3 years ago, and I haven't made a card for the customer since. She ordered a special one for each of her family, then when I rang to say they were done, her daughter answered and told me they had bought a box fronm somewhere at half price. It's a good job I hadn't personalised them, I would have gone loopy!! luv Jacqui xx