If you are that frustrated with it, maybe you should just let her have the pan (what is she going to do with it anyways if she was asking you to bake her cakes), keep her $20 (is your suffering worth it), and call it OVER and analyze what you learned from this situation! Frustrating, I can understand, but your sanity is worth so much more than a total of $50. And besides, you did the cake for HIM anyways, not HER! Sorry to see that she has done you this way!