Exciting times! And how fun to win a photo session! Maybe your MIL didn't get a say in much about her own wedding & had been looking forward to planning yours ever since...kudos to you for breaking the cycle!
I had my mom & my aunt giving input on my wedding, but either we were all pretty flexible or I've blocked it from my memory
A couple portions of my reception were, however, led off-course by the DJ and, 15 years later, I'm still irritated by that!