lying is not a crime, but being abusive to you is. so is bullying. if she's done either of those things when you asked for your money back, then you have cause to go to the police. she also sold something under false pretenses. the only way to know what the police can do, is to ask them.
definitely follow through on craig's list and all the other things people here have suggested. call the local paper and ask if they'd like a local human interest story.