Why is there always at least one person like this in every work enviroment? We have one and once I blew up at here. Since then she hasn't crossed me. It sounds like most people in the office will understand why you were upset. She most likely has gotten under their skin as well. I find that people that constantly do these things are very selfish people and need attention all the time. It doesn't matter if the attention is negative or positive. I've also realized that some of these people have horrible home lives and never seem happy unless they are making someone else miserable.

Next time, just think of her as a 4 year old child looking for her mommy's attention. Our favorite coworker usually shuts her mouth after she is approached by whoever she is harassing that week.