Are you a teacher and have been bullied by another teacher/coworker?

If you have, how have you handled it? Did you confront the bully? Reason I ask if because I'm a science teacher at an elementary school for Kindergarten through 3rd grade. I sent a note back to a 3rd grade teacher letting her know that a few of her kids are not allowed to come next week (the kids come once a week for 40 minutes.) because of their behavior. The kids were very disruptive today for the whole time, defiant, and were using the furniture in the classroom like they were at home (putting feet up on chairs, desks etc). The teacher waltz into my room after school today, telling me that her kids will be coming next week. I stated that they are not suppose to come to science next week and that if she sends them, I'll have them go sit in the office. She also questioned why and if I want to continue in teaching and went off by claiming, "Take my advice, coming from an oldie...." She then rolled her eyes when I stated that I have been working with kids since 1999 and I do know what I'm doing. Also, she interrupted my lesson a few weeks to tell me that it's ok for her student to sit alone in the library when no one is in there. (I had told this student three times he could come in my room during my lesson or sit in the office.) Basically her demeanor is overly aggressive, treats me like I'm incompetent and questions almost every move I make.

If you've been bullied by another teacher, or coworker, how did you deal with it? The scary thing about this is that this teacher is the union representative for my school. YIKES!!! Thanks for any suggestions.