Dear Annie: I have worked in the same office for 18 years. For many years, there were five of us in our division: three women and two men. One of the men left for a different job a year ago, and he was replaced by a woman, “Carla,” who is very difficult to work with. In fact, I’m convinced that she is a liar and a troublemaker. The only man left in our division, “Fred,” is quiet and shy but…