If the office is small or there's not much going on in their own lives, they look for drama in other people's lives. To gossip or bully.
Two suggestions come to mind In your situation OP
Call them out on it, again and again. "hey Where's my invite". Or if someone ignores you, repeat it again and again. Or say "looks like your phone is broken because you didn't read x". If you start being confrontational and borderline rude, they will see you're not someone to push about (that's if you can handle that type of thing).
Or don't act like it bothers you. I'm not saying ignore it, I'm saying act glad that you're not part of the group for whatever reason. They went out for drinks... Where? Uegh that place is so horrible. They met for a virtual quiz, urg how boring! Belittling what they are doing will take Susan down a notch.
Also if you're speaking, speak loudly and try to not be ignored. It will feel awkward if you're assertive and and susan changes the subject without addressing it. Or if she has an opinion "Susan I wasn't talking to you"
I started to become like this when I realised
These are all very hard things to do. It might seem petty to some, but from my experience people like this know what they are doing and enjoy it. No amount of having a conversation or saying sorry will do anything.
Stop letting her enjoy what she is doing, and she won't do it.