[Alouette]

the school could have made an amicable accommodation had they been asked (like send the kids to the library while the music class was going on with the Christmas carols),

The pageant was not even held during school hours. It was a special activity which was entirely voluntary. They could have opted out with no problem at all but Mommy Dearest wanted her little darlings to be in the glee club.

[HiTech RedNeck]

Oh I see. She wanted glee for them, she just didn't want THAT kind of glee.