A coworker who was the reason why I was moved to another department (she is friends with the manager) changed departments herself and now I sometimes have to work with her.

First time she saw me at her new position she greeted me as nothing happened, as she wasn’t the reason why I was moved laterally. I replied with a non effusive hi.

I don’t engage in non job related conversations with her, if I have to work with her I just ask her in a neutral voice where is what I need and proceed to do my job. Otherwise I avoid her because I don’t trust her. I don't have to work with her whole shifts or every day, which is good.

The incident I mentioned on my first paragraph happened 2 years ago and I still remember it enough not to like that person. I don’t know if more mature folks would have already forgotten about it but I cannot. Am I holding an unhealthy grudge? I mean I’m happy if I don’t have to see her.