Just under a year ago I started in my present job.
One of my new colleagues made it clear to me that she felt she should have got the post I was given.
On a day I was left in charge of the team she verbally challenged me and flouted various aspects of the company health and safety policy, making the day stressful
When I reported this - as I had to - she was spoken to about her behaviour but I was told that she had 'mental health issues'.
She mostly does not make any verbal response if I say 'Good morning' or 'How are you' etc, but pretends she hasn't heard. There have been a few occasions when she's been talking generally to colleagues about her life, when she has responded to me if I've asked a question. But otherwise she simply does not talk to me other than, say, 'Could you pass me that file?'
I am on a higher grade than her, but if there's any occasion when I ask her to do something, she will normally challenge me.
On a few occasions I've told my line manager that this is a tricky situation for me but the response is 'Oh X is just like that.' (She isn't 'like that' with other people.
In a recent appraisal I've been told that I need to 'work on' my relationship with this colleague, which is being seen as a 'personality clash' for which I am 50% responsible. My Manager also described X as 'a sweet girl'.
The trouble is that I think I have 'worked on' it by attempting to remain calm and pleasant and making a few pleasant ordinary remarks 'How are you?', 'Did you have a good weekend? each day.
There really is nothing more I can do. Or is there?