Guest List Dilemma

So long story short my fiancé's friends girlfriend is a covert narcissist. In the beginning she hid who she really was. She seemed like a decent person than I started noticing strange behavior right after I got engaged. She would give me dirty looks when people would tell me my ring was beautiful and she even started wearing random ring on her ring finger pretending to be engaged so she would get attention. Most recently people have came forward and said she has been making rude comments about my wedding plans and at my bridal shower she was telling my guest that I knew about the shower and that I was not surprised because it looked like a had a brand new dress on. The week prior she came out with 2 of my friends and randomly asked for 1 of my friends phone numbers who she just met and doesn't even know her and has been creepily texting her non-stop. And don't even get me started with the backhanded compliments. It's starting to get uncomfortable and I no longer her want to be around her. it's pretty clear she is jealous and secretly envious me. I do not want her at my wedding but I also do not want to hurt my fiancé's friends feelings because they are close. Do I just take one for the team and allow her to come? or do I put my foot down and uninvite her? desperately seeking advice.