As infuriating as it is to have your designs blatantly copied, I've never understood the drive to not have a website because of it. To sell your items, people need to see them. If people see them (anywhere, even at a fair), you are at risk of having them copied by unscrupulous competitors. It seems to me to be a case of cutting off your nose to spite your face to close your website, though.
If it were me, though, I'd name and shame her.
State, boldly, on your site or stand, that you are the original designer of the much imitated design and that people should beware of cheap copies.
Take a leaf out of Princess Lasertron's book. Her bridal bouquets have been much copied (including by me, though I would never make them to sell) and has stated as much on her etsy page:
princesslasertron on Etsy
or similar.
If I were you, I'd big up the fact that people are copying you! That's a good thing! It makes yours, the original, more desirable, it really does!
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