Tell your DD we are huge fans too, and we love all the dancers and performers! DD is 8 now, and has adored this show since she was 2. We usually catch it multiple times on our trips. We will see it a couple of times from start to end, and then any time we are anywhere near the castle and it is playing, DD makes us stop and watch the rest. I thought as she got older she might not have to see it more than maybe once on a trip, but so far that has not happened. We watch a youtube video every now and then if we need a Disney fix too.
OP, I don't know how crowded a time you are going, but I don't think we have ever waited more than 15 minutes for it, and that was the time we sat down at the very front row. DH (a pale red head) hates waiting in the hub area during the day for shows to start because there is no shade and the sun just beats down and reflects off the concrete. It isn't that packed. You can get pretty close just 10 minutes before the show, and often even right when the show starts. Sometimes you can get pretty close during the show as people tend to be pretty spread out in the area.