They need to report her to the Public Security Bureau before she can come up with an excuse (such as unfit teaching) not to pay them. I'm sure you all have Chinese friends who would be glad to help you out if you cannot speak Chinese. Also there is the S.A.F.E.A. at http://www.safea.gov.cn/english/
You can also report her to the Embassy of your nationality. (If you are Canadian, the Canadian Embassy, and so on). She HAS to pay money if she owes it, but the teachers need to defend themselves, or Lian will walk all over them. She's fired all of her employees before. I have seen her fire 11 teachers at once on one occasion. Good luck and make sure you get what you are owed!