March in at pick up time when it is full of kids and babies and announce "Look, this one has got chickenpox!" and wave the baby around like you just said it got A level maths already!! Stupid stupid woman. But considering the baby (probably about 4 months old) already had her ear pierced, I don't think the actual health of the baby is her first priority, more how much of an accessory the baby can be. The little thing has no chance.