Was just wondering if anyone else has had this experience, and if so what did you do or how did you manage it?
New manager has started at my place of work. Let's call her Sarah [not her real name]. I directly report to her but she doesn't have hiring or firing rights [thank god]. Sarah is very forthright and a big personality, wanted to make changes immediately, did this without any consultation with her team [we have all worked there for between around 4 - 8 years so far]. She also speaks about her achievements quite a bit. The first time she did so I thought wow, how interesting. The second time I thought I'm sure she's told me this before. The third [fourth, fifth...] I was like 
However this didn't initially bother me too much, thought she was enthusiastic and dynamic, maybe a little insecure and trying to make her mark in a new company, fair enough. However I started to notice that Sarah disliked any disagreement with her ideas and plans or changes she wished to make. Little things at first, for example when I tried to point out [very gently] why an idea of hers might need input from the IT dept... she thought it was unnecessary and was very dismissive of me, however I was later proven right and she had to backtrack on her grand scheme awaiting approval from IT.
Then she was unhappy with me as I had CC'd her in to communication I had with the manager above her. Sarah wanted to be the one who was directly emailed with the other manager CC'd in... I couldn't understand her upset as we had spoken about the issue in person and Sarah herself had asked me to email this manager. I had therefore CC'd Sarah in to my communication with said manager purely as a courtesy and to let her know that I had done as she had asked... But no, she arranged a meeting with me to let me know I had undermined her and she wanted all communication to go via her relevant others CC'd in... Again I was a bit
about this but thought I would do as she asked if it was so important to her.
However more recently communication has completely broken down between us. We had a disagreement regarding an issue with a client and to my mind this could have been solved by talking it through together and reaching a consensus. It is relevant that we are considered 'peers' at our place of work and that Sarah is the manager with admin responsibility so when it comes to the actual work the norm is that we would work as a team to iron out any issues. However Sarah seemed to take great offence that I saw the situation differently and also seemed to view this as my implying she wasn't up to the job [I genuinely wasn't]. She became incredibly rude, aggressive and belittling in a meeting we had together to discuss the issue when I genuinely felt I went in there with the intention to smooth things over and find a way for us to work better together.
I am not sure what to do now. We still have to work together but are pretty much ignoring each other apart from a polite nod of acknowledgement if we pass each other in the corridor. I know this is not great behaviour on my part but I am so unsettled by Sarah's attack on me and I actually do not know how I can continue working with her.
The next day I went to speak to my manager [both mine and Sarah's] confidentially to let her know this situation has arisen but I told her quite an edited version about communication break down and different working styles. Manager however has offered that she acts as mediator or that we get HR involved. I told her I wanted to sit on it for the time being while I tried to work out what had happened and whether this was necessary or not.
So... has anyone ever had a colleague like this and if so how did you handle them? Any advice or words of wisdom would be welcome!