I think I'm less confused then others. She did that because she doesn't know if the mysterious bottle is dangerous to inhale. Plus it stops Tim from giving the signal to pour poison in the well. Correct me if I'm wrong. Ofc she doesn't know if that guy is bluffing but she didn't want to take the...
seems totally pointless to not act just so you wont stand out, like fling a rock/eraser hard to enough to knock him out/blow his brain out instantly. Think the writer just want to write something "horrible" for the sake of it, so that it force something to happen.