I suspect the girl is in on the whole thing. Tea is such a popular part of Chinese culture, it is almost impossible to find a chinese who doesn't know what a tea ceremony is (especially for an educated teacher). For her to say that she has no idea and to suggest that you try it out is rather suspicious.

I wouldn't call this a scam though, you may have been charged highly inflated prices, but you did get some great tea service. A scam is when they advertised great tea service, then sold you crab grass (which is what happened to mine colleague when he travelled to GuangZhou).