I think the WTA needs to impliment some rules about going to the bathroom so often during these matches, especially after you loose a set. I think if you can't handle the mental preaure you need to have another alternative. I just don't like the idea of the women players running to the bathroom when they get down.
She takes it every time i have seen her anyway after she loses the set, even at Wimbledon last yr against Kuznetsova when she lost the 1st set she took 1. The commentators were saying it was unfair but clever from Vaidisova, like it was some sort of experienced bathroom break, and she hasdone it here when she has lost a set and it has worked