Bridesmaid expected to be Maid of Honor

Hello! Sorry if too long: I am getting married in January 2023 and I am still dealing with drama with one of my bridesmaids (bridesmaid X). I know her from college, and she has always wanted to be center of attention. But I picked one of our college friends to be my MOH for the wedding because my MOH was super helpful to me as soon as I got engaged and cares about my feelings. I sent out bridesmaid proposal boxes to everyone in Dec/January and a box to my MOH asking them to be a part of the bridal party. So i assumed bridesmaid X knew she wasnt maid of honor because it said “will you be my bridesmaid”. Later on, she texts me to talk and we talk on the phone and she said she was hurt, thought i would tell her she wasnt MOH, she expected it. I explained to her that initially I was going to have my cousin (bridesmaid Y) be MOH but as soon as I got engaged bridesmaid Y announced she was pregnant so I wasn’t sure if she was even going to be a bridesmaid. This is true but also bridesmaid X isn’t great with planning and has been kinda self centered and my actual MOH has been very supportive. My MOH told me that when i got engaged bridesmaid X said in a video chat with other friends and not me there “i can’t wait for her wedding and be maid of honor” and “im obviously her best friend” and it seemed more about her. The only indication I may have given her was 2-3 years ago in college, probably drunk, i might have said be my maid of honor in my wedding. But i wasnt even dating my fiancé at the time. Fast forward to now, after i talked to her and said im sorry you thought that, my MOH said that bridesmaid X is still very much pissed, jealous, and said she wanted to talk to me before she commits to the bachelorette party (when 2 others have already dropped). Bridesmaid X wants to talk to me soon and I need advice on how to make things clear that Im not responsible for what she assumed? What else to do? Even have her involved because she is being self centered?