moh Dilemma

I’m having doubts about who I was going to ask to be my MOH. I’ve only known her a few years but since I got engaged, she has been so excited and wants to be involved. She buys things and is already wanting to plan parties, but part of me is wondering if she is just doing this because she thinks she won’t get married. My partner jokes she is taking over and that it’s 3 of us getting married.
Has anybody else experienced anything like this?