Thoughts confronting friend who cheated with my husband

Hello, I am struggling with thoughts around a former friend who shared a couple of drunken kisses with my husband a few years ago.

I have totally forgiven my husband for the cheating (long story, but I have). But I have not forgiven her. And I have never confronted her about it — I don’t think she knows that I know (I suspect she might but I’m not sure.)

We stopped hanging out with her (obviously — I can’t stand the thought of being around her ever again) but I’m pretty sure I’m going to be confronted with her soon. A mutual friend of ours is moving back to our city and there will be a party for him.

I don’t want to go to the party because I don’t want to see her. Or should I go? I know I should forgive her but I’m still mad. Help, please!