First off paying that much for a shave down is insane!!!!!! You my dear was ripped off. Even when you have a dog's coat cut into a specific "style" it's never that much. I would not have paid her at all for doing such a thing if it were me and my dog. The only things I would have given her is a good tongue lashing!!!
Your baby's hair will grow back in a few months, so in the meantime just buy yourself a really good clipper and scissors.