Sending empathy, I know this "type".
I guess I'd look at it from a pragmatic POV - is there anything you get from the group (or some people in particular you wouldn't mind keeping close or exploring to see if a 1-1 connection. For example, the woman who doesn't invite her?).
I'd work this out, then maybe develop whatever it is you want to keep and phase anything with her in it out.
You may have to just cut your losses, celebrate the memories, and move on. Nothing is more important than your peace of mind.
If the group isn't offering a huge amount of benefit anyway or is just a chat group on Zoom I'd probably downgrade it (see if there's any nice invites but just sounds too overdramatic and too much effort generally for a few chats?).
I've found group dynamics often mean that no-one will stick up for you, but then if you leave the bully targets someone else and the group stays toxic.
Not really sure whether that's a good thing or a bad thing, just an observation!
Everything and everyone moves on ultimately -
Unless there's a huge positive practical or situational reason to stay in touch I find these "lighter" social groups often do drift away eventually or as you've found, you get a nutter who ruins the tone.
And unless you want to be scheming Machevilli back not much point, there's so much good stuff in the world to do and experience!