morethanpotprints,
ask, she could always help out with the sorting when they are shut,
We have in the past done shoeboxes, or smaller, full of goodies, like art stuff, stickers,puzzles, games comics,balloons,sweets ,note books and joke books anything that will create a little fun, to go to homes with children, the sort of things children who have privileged lives buy with pocket money.
if they don't want her on the premises (they may worry she will spot someones mum from school) she could organise making up some boxes with her friends, we make them up in age groups, some which would suit any gender(for when they don't know the age of the children or gender) some boys and girls, mark with a removable label who the package is aimed at, some of the older volunteers find it hard to judge.
Children are best placed to know what other children will enjoy.
Anyone donating, spare animal food goes down well, people don't want to give up their companion.