If there were three Danes and one Chinese left in the semis, which is not impossible given that Denmark is pretty good at badminton, the Danes would not conspire in the same way. And if they did the story would not be suppressed, and people would not consider them traitors when they came out with it.
As the comment that kicked this thread off pointed out, she's considered a traitor not for talking about the badminton conspiring, but because she is signed on to an organization openly dedicated to overthrowing the Chinese government.
It's perfectly normal for different teams to have different tactics, given the same inputs. Why should the Chinese have followed the hypothetical tactic chosen by the Danes?