I'm well aware that I'm projecting, but the OP's new work colleague only cares about herself.
20+ yrs ago, a teenage boy whom I didn't even teach ran into my classroom after another boy and proceeded - with some glee - to punch me in the stomach. I wasn't visibly pregnant - I was waiting to re-test - and I miscarried the next day.
I couldn't prove that I'd been pregnant and I reasoned that I didn't want the boy to carry that guilt for the rest of his life. How stupid I was: that kind of person cares for no one.
He also punched the two male colleagues who came to my assistance.
I can't remember much of it now. I remember trying to keep away and I remember miscarrying. I wrote a report at the time which I destroyed when I came across a copy of it some years later. It sounds stupid, but I can't remember the punch, though I described it in the report.
The boy claimed that he was the victim of a homophobic attack and that I'd "got in the way". No. He was the attacker and I was trying to keep clear - I remember that much.
The police "lost the paperwork". SACRO wanted me to hold a restorative conversation with him, since he was a "victim". I refused.
A year or so later, he was thrown off a college course for being violent.
Years further on, I was horrified to be confronted by some giggling teens who wanted to know whether I remembered "L". Was it true that L had punched me in the stomach?
At the end of the lesson, I informed the girls concerned that I'd be grateful if they could convey to L that I was pleased that he was now admitting his crime, that I'd miscarried as a result and that he'd be hearing from my lawyers. (A bluff, of course.)
I later realised that he'd put about a story that I was a homophobe. I never taught him. I didn't know who he was and I had no idea that he was gay.
My bluff had the desired effect, however. I heard no more about it at work and the thug moved to another part of the country. I admit that I have Googled to make sure that he's still away from here. (His family still live in the area, you see.) He's working as a "spa manager and massage therapist" in a city and getting 5 star reviews.
As I said, I'm projecting here. In my experience, a leopard seldom changes its spots. The OP needs to protect herself.
She can do that by making a simple statement to HR. She should have someone with her as a witness, preferably a union rep. The OP was not "just bullied". She was harassed, she was beaten and she was stalked.
The new colleague has already blocked her way at work and has tried to change the narrative. OP needs to put herself first.
Hindsight is a marvellous thing. I made life more difficult for myself by "being kind". Never be kind to a sociopath.