She needs 'something to do' while at rehearsals, when it's not her turn. We sent paper and crayons a few times, and then stuck her name on a label on the back of a really old, battered, iPad and sent that.
Didn't think anything of it, until another mum and her daughter were aghast at me tonight, when I sent her in with it.
My daughter said 'oh don't worry it's only my old iPad'. 
Feel like a dick.