All the degrees are not of influence on whether or not you can make it to the show. You can also just want to see the shows without it. I understand you are a proud mother, but let's get back to the basics: there is a show, your adult daughter wants to see it, but there is a family dinner scheduled.
If, for whatever reason, the family isn't done eating by the time the show starts, is it acceptable in your family if she excuses herself and skips dessert? Or do all activities need to be done together? This differs per family and you need to decide how the dynamics for your family work.
Is her concern missing the show or not getting good seats? Is her plan for the other shows to be first in line waiting for the theater to open to have a choice of seats? I think the theater opens 30 minutes before showtime, and people start lining up before that. So that would be leaving Palo around 745 latest.
Does she want to change from her dinner outfit to something more comfortable for the show and rest of the evening?
Or is she ok with entering the theatre 5 minutes before showtime and take whatever seat there is? As it is not done (in my opinion) for 1 person to save seats for an entire family, is your family ok with splitting up for a show?