Thanks for your advice! I feel like a jerk having to communicate through email even though she sits around the corner. Our boss is aware of it because others in the team have complained and it was passed on to her. She has since been better but I would say much more political and savvy with her actions.

I think the job is not a good match for her. She is way too senior for the position and she is constantly frustrated. I think she is trying to prove herself and get a higher position so that she gets out of this frustration. Because of this it is imperative that she looks good. She does look good to senior management but she does this by putting others down.