Has anyone had a potential buyer do this?

Background, I'm a jeweler who has sold at festivals for 30+ years and also sells on etsy, and I don't always stay on top of metal prices. So my prices on a few of my gold items are fair to me but also a little low. Well a potential customer contacted me around midnight and asked me to "justify" (yes the word used was justify) my low prices, which brought to my attention said prices are just barely above spot. So I thanked her for bringing it to my attention, and took the listing down as gold items are not my big sellers and she would definitely not buy it if I raised the price to where I would make a profit. Now she's asking why its gone and if I won't sell it to her for the "quoted" price.

Personally I've had customers try pulling similar stuff at festivals and end up being a royal P.I.A. down the line. So I want to know should I just tell her I'm melting it and sending it to scrap or relist it and have to deal with a potential pia that will cause me headaches down the line.