Earlier quoted context omitted.
There are sources of anxiety without clear solutions. I have a stalker. There's low-level harassment continuously, but every few months, she does something crazy, and my life is completely disrupted. I have no idea what to do about it. It's nearing a decade....
Can police help? Alternatively, (non-violent) retaliation? Seems like there's no downside for this person to be harassing you. Creating a downside might make her think twice next time.
Threatening to involve the police is a common way women abuse men. You can of course involve the police yourself but they often won't listen.
I had an ex try to create a situation where I would be framed for rape by creating fake social media accounts purporting to be me. Luckily she wasn't smart and the police saw that all the accounts were obviously created by her. Yet they still didn't help protect me from further harassment or do anything to her for trying to frame me and making false police reports.
Sad as it is, probably best to just try and ignore her and consider going by an alias online and moving house.