If she was in a concert with the others, just who would be looking at her and the violin? The audience. Everyone looks at their own kid or G’kid, but in this situation all eyes would be on her. Not fair to the purpose of the music program.
Bovine Scatology!
Given the stupidity of school administrations, I bet these “teachers” would object if the child turned up with an authentic stradavarius(sp?). “it would be unfair to the other students”
Musical instruments are very personal.
As for your example, I think parents only see THEIR little maestro to the exclusion of all others.
She might have received passing glances from the audience, but most people focus on their own kids/grandkids at school concerts.