Same room with someone you're not friends with anymore

I let go of a good friend last month. Our daughters would hang out a lot. She had been acting jealous, petty, negative, so on for a while and I just finally had enough. I'm too old to stick around for that. Anyways we used to go to bible study together. That's starting up again in 2 weeks and I'm absolutely dreading seeing her again. I don't want to talk to her or even look at her. What do I do?! 😩 Please give me some much-needed advice. Thank you very much.