ichelle, i'm so sorry you have to deal with all this crap. i love how she thinks that because she's a consignment shop, she is absolved somehow for having sold you a fake. just because customers drop off replicas does not mean she HAS to sell them. what's even more interesting is that buying fakes isn't illegal, but selling them is, so it's irrelevant whether or not she originally purchased the fakes herself. she's obviously irrational and obstinate to boot. it sounds as if reasoning with her won't work. i'm not sure how effective threatening legal action and law enforcement will be, but since you lost quite a bit of money, i would try to at least file a police report and see what they can do.
you have your credit card company as a last resort. trying calling them again to speak to another agent. when i purchased a fake and the ebay seller refused to refund me my money, i called them to do a chargeback and they agreed to it within ten minutes. my claim did not take 90 days. perhaps you were speaking with someone who didn't know what they were talking about? good luck! i am hoping everything works out for you in the end.
ooh this is going to get good, and i hope this lady learns her lesson from ripping unsuspecting customers off!!! and more importantly, i hope you get all you $$ back