coworker bullied me, and a few others. She was forces into a PIP and had to do extra HR training. Still didnt stop her, I left the job (not because of her) so I dont know what happened. That woman definately hated herself and used shit talking as a cope. I only found out she was talking about me because another coworker, a friend, told me he yelled at her one day about it, sick of hearing her talk about me when there was no call for it.

Idk what I would so in your shoes, but someone should talk to the person about it, it's not cool.