Erica and Jeb from HullStreetGreen says
I've also read about these things happening and someone says it happens to her all the time and what she does is just moves onto something new and amazing so she's always one step ahead!
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I love this advice (from HullStreetGreen)!
And since you stated that the seller in question has just started to make jewelry, maybe...just maybe, she will use this as a platform to improve her talents and also move into something new and something that is uniquely hers. I will agree...it stinks, but like many of the others say, taking it as a compliment is probably the best approach. :)