I don't think that you over-charged this customer because you were upfront with your costs. I imagine that she pushed the envelope with her complaining. I think I would have told her to go back to her sister, although as someone said, maybe the sister was tired of her complaints. I also think that dunster and tartan both gave excellent advice. My niece has started a LA quilting business with her hubby and she told me she charges .01 per inch, mainly because she is lives in a small community, also because she is just starting, but that was the going rate. I like the idea of mentioning it at a guild mtg. so others will be aware and could negate any negative feedback the customer may give. Good luck to you in starting your own LA quilting business.