If she won't return your money, you can easily take her to small claims court. I think it costs $35 or so to file a claim - not much. Sounds like you definitely have cause for getting your money back. Know that even if she won't respond, there are ways to reclaim the funds (not sure about lost opportunity cost).
I *almost* had to do this with a website developer; luckily, he caved and returned my money (after not building my site, as contracted).
Thanks for all your support and advice. Just to follow-up, I was finally able to get a response by asking for a refund. She told me she "didn't see" all my prior emails *sigh* Nevertheless, she helped me get it finished (although a lot I had to figure out on my own) and I'm back in business.