In every bloody way!
She has just moved into our department from another part of the University. I've known her vaguely for years, but never really had much to do with her. She's the same grade as me, is really successful - brings in money, publishes etc etc, but she seems to have a problem with me.
It's really subtle PA type stuff, like making snipey comments about things, like telling me I'm rude if I make a sarky comment....then she will start bitching about other people in the department. Another thing, when people come in to our shared office to see me, she will talk over me. I had a colleague who's also a friend come in today to ask me for some advice about something I used to work on - but whatever I said, she interrupted with what she though the answer should be - which was complete rubbish btw. She also seems to be going behind my back and telling other people that I'm not doing my work properly, is constantly checking up on what I'm doing - wanting to know if I'm working on what I'm supposed to be. She's not my line manager! We're the same grade and have similar roles academically, but she is the course director of a course that I'm teaching on this semester, so she's always checking up on me, giving me things to do for the course and then telling me to changes parts of my lectures.
I know that I can be arrogant and gobby and have no diplomacy or tact - but I can't think of anything that I've said to her that would cause her to act this way, other than a throwaway comment once about how I never needed to work for exams (I didn't know then that she had to work very hard and revise constantly to get where she is). Can she still be pissed off with me because of that?