Oh my goodness.. There is no doubt in my mind that she has been blowing you off, and it upsets me so much that someone like her would do that. People like her can make other beginners look bad (like myself). I'm just starting to accept fursuit commissions as well, and I already have three paying customers. I keep my FA journal updated with my price information, requirements, EXAMPLES and fursuit status. Also, I am NOT impressed with her work especially for $600. I hope you can take legal action and get as much money back as you can. But if not.. I really hope you can live without the lost money.

I truly wish you the best of luck. <3
I'm Fuchsia on FA. http://www.furaffinity.net/user/fuchsia/ :3