Why would 50 something year old female coworker insinuate that I have “mental issues” just because she doesn’t like me despite me not talking 2 her?

She hates me…. despises me. Maybe because I’m the only one that had called out her horrible behavior in the past. Anyway, I always keep my distance from her and avoid all contact. However, she’s always complaining about something regarding me…I’m not in my desk, I don’t answer her calls, I don’t keep her up to date when I’m off…me doing “whatever I want” according to her or me simply existing. Everyone else hates her but have normalized her behavior and nobody speaks up. Anyway, a few weeks ago I heard her gossiping about me with a coworker saying…I’m crazy. Then again today during a workplace safety meeting the topic of safe and hostile work environments. She raised her hand and asked about…what if there’s a coworker that can possibly have mental issues, is it reportable?

I don’t understand what’s her hatred towards me. Anyway, I’ve talked to my manager and he was useless. I’ve talked to the union and they were useless too saying we’re both bargaining unit employees and they can’t intervene. So, what exactly am I left to do when she hates me…is supposed to be my technical lead to answer my question but I can’t due to her personality. What am I supposed to do in this situation?

I’m 25 years old

Why would 50 something year old female coworker insinuate that I have “mental issues” just because she doesn’t like me despite me not talking 2 her?
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