Hello Mary Anne,
Wow, what an exciting opportunity and honor for your daughter's band! I am sure tons of memories will be made for her and her friends, as well as for your family. I always enjoy watching the high school bands perform around the parks during my visits. Seeing those talented kids adds that extra pixie dust to the trip.
Traditionally, as long as your daughter is linked to your
My Disney Experience account under "my friends and family", any pictures she is in should appear on your
Memory Maker, even if she is somewhere else in the park. Keep in mind, since her reservation will be under a group reservation, this might be the exception. I would suggest calling
Disney's PhotoPass Help Center at (407) 560-4300 (Sunday through Saturday 9am-9pm) to clarify the terms and conditions in this unique case.
I hope you have a magical trip enjoying the sights and, more importantly, the sounds of Walt Disney World!
Say cheese,
~Allison L