I do use bibs at the table for all kids up to age 3 so food goes on their trays and in the pocket of the bib rather than the floor - assuming most of it goes into the mouth. But yes changes of clothes are for the exact reasons you said - emergencies. IF she wants to bring some clothes for every day fine BUT she must still leave something at the daycare for emergencies per the rules. It's the same with soothers or shoes coming every day. There is bound to be a day it gets forgotten or not replenished and there are too small pants or two tops and no bottoms or whatever.