Why is my manager treating me unfairly in the workplace?

I have been working for a new company for four months. From the get go, I’ve had a strained relationship with my manager. When I first joined she seemed to be ok with me and showing me the ropes of the job. There was no indication that there were performance issues with my work. In our one to one online meetings early on I noticed she would sometimes say that it was concerning that I was struggling with particular aspects of the job and I’m not where I need to be at this point and she would have a smirk on her face when she said this. I didn’t think much of it at the time but then in my 3 month probation review meeting she dropped a bomb on me and told me that I was not where I needed to be and there were issues with my performance at work related to accuracy and not communicating with colleagues appropriately regarding tasks and set deadlines. She told me that if I continued she would extend my probation or dismiss me.

I reached out to a staff member from another team for support with my disability. He deals with disability in the workplace and reasonable adjustments. My manager said what I did was wrong asking for support for my disability outside of the team and that she would now have to fill in all this complex paperwork to support me.

In group discussions she ignores my existence whilst speaking to other colleagues and gives me dirty looks. I’ve noticed she will look me up and down sometimes and give me judgmental looks for no reason. In all our meetings now she’s constantly picking apart my work and giving me corrections. There has never been any praise of my work. I get the feeling she just wants me to quit. During events she also micromanages me. If I go up to a guest at the event to help him out and start speaking to him she will glare at me and then come up to us and take over so I don’t get a chance to speak to him. She also ignores me the entire event but speaks to everyone else but acts like I don’t exist.

What is her issue with me?

Why is my manager treating me unfairly in the workplace?
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