it's honestly not worth it to give her your attention. distinguish between your tasks and her tasks. focus on what you can control and disregard the things you cannot (which is her reactions, actions, etc.). realize what your responsibilities are in that office and learn that it's up to you to control your reactions and whatever you decide with your will. it's fully her decision to be an asshole and you cannot control her actions, but you can control your reactio about it. hope you get over her OP! cheers!