I coordinated a couple of weddings. Fun and stressful. Enjoy the run up and planning as much as possible.
Try to have a no wedding planning talk zone at least once a week. Be a great listener and be the calm force in this. This is her super bowl in many ways so she might be amped about things you never thought about.
Looking I wish we would have done more with friends and family from out of state. So many people I had not seen in years and I only saw some for 30 mins or less.
Finally go ahead and expect something not going right. How you handle it will help her in the end.