I work in a small section in a large organisation. For the past 3 years I have been the supervisor of a toxic, obnoxious person. I have always thought I handled her well but today she really p*ssed me off. she has always reminded me and anyone who'll listen that she "taught me everything I know" which is true. As a result she thinks SHE runs the section. She asks me who was calling every time i get a phonecall, and what did they want. today she told me what to tell our boss and would not listen to me when I said I was well capable of dealing with him. Because there were other people in the office - and I admit because I'm not assertive enough - I feel that I let her get away with bullying me. Later when she was passing behind me she stopped to read the email I was composing. I have decided to take her aside tomorrow and make it plain to her that I am her boss not vice versa. Btw, when I say she is toxic, she behaved the same way with her previous supervisor, and unofficially I've been told that she cant be transferred as no other dept will have her. She is a glass half empty person with knobs on. She hasnt a good word to say about anyone and moans constantly, about the job, other staff, everything. would anyone have any suggestions as to how to tell her to back off, without coming across as a bully myself? I should add that she has a lot of illnesses and conditions including depression and attempted suicide in the past. TIA