Bullies always wear a mask. If they didn’t, no one would give them a minute of their time so they have to pretend but it’s usually doesn’t last forever. People eventually figure it out. I’d keep my distance and just enjoy my life not worrying about this person. She is unhappy and misery loves company. But you don’t need to a company for her. I’d not stop going to events because of her though. Her misery is her issue, not yours