Help me decide what to do?

Praise Jesus! I need help deciding what to do. I have always kept in touch with my two best friends from high school, Kate and Leigh. We get together every few years and have a reunion dinner a catch up on our lives. Next month we had one planned and I called Kate to set up some finale details. She told me that she had something to tell me she thought I ought to know. Leigh recently abandoned the Lord to take up with some witch coven! I guess she is an apprentice getting trained by them. I was shocked. Now I don't know if I should include her in our reunion. I asked Kate and she said its up to me to decide if I could be around her or not. I have prayed and asked Jesus to tell me the right thing to do. I have prayed for Leigh too but so far Kate says shes still involved with this evil coven and says its the best thing that ever happened to her! How can that be? And what should I do about her?