Best of luck to you, Holly! Becky, from your posts it seems that you have done a great job preparing your daughter for this day.
Just so you know, 27 is my lucky number and I'll bet it will be for you both as well.
I was diagnosed with Scheuermann's Kyphosis at age 16. I had an 80-degree thoracolumbar kyphosis and mild scoliosis. My posterior fusion surgery was performed by Dr. Sethi in Seattle on Earth Day 2014.
It reduced my kyphosis to 47 degrees and my scoliosis to about zero!