now this is something i can actually understand people being mad at. This is so out of character for our female protagonist that even i gotta complain. Really, there wasn't even a frame dedicated to the thought process that led to her blindly drinking something from her opponent. I'm thinking that this is either a weak, uncreative plot device to keep her talents hidden for some reason(and i can think of no reason why cuz the fact that no one knows her talents is part of the reason why she gets picked on for being weak/undeserving of her position and no one is really on her side except the two male leads and sometimes the golden horn lady is around)--
OR, thinking o p t i m i s t i c a l l y, she's more boss that we thought and this is either a part of her plan or she's so strong even drugs can't bring her down.