Our department is reorganizing, again. There have been changes but I had been with the same group of colleagues over the past several years. It grew from 5 of us up to 15. In the grand scheme of things (50 schools in 3 groupings) we have had the highest quality programming and highest work loads. I have felt good among this group of coworkers, I tend to keep to myself since I don't gossip but they are good people with good programs.
So now we are regrouping and a new supervisor, there are just 4 of us with one supervisor. We are arranged geographically which makes sense because for things like break camps and sharing staff it is supportive. I am happy with the supervisor, I know him and he is someone I trust. I told my current sup that I will miss her and I meant it. However in my group of 4 I have serious concerns. One of them I have been working with on camps this year. She plays nice to my face but I think she is actually one of the most negative, two-faced, untrustworthy person I have come across in a long time. All the details are boring but 2 people shared with me what is being said about me openly by her. Good to know, I already was asked a lot of questions by my supervisor based on what she complained about, and they were all false. I had 3 supervisor visits at camp days I was in charge of and had very good feedback on every one.
I am not sure exactly how to manage this. Part of it is to realize that many people will see her behavior for what it is and not worry too much. However I can't totally ignore this because she could cause actual negative impact. I have a good reputation as a high performer in our department, but no one is immune to gossip and attack.