well I was
going to suggest the starch packing peanuts the type that disolve when wet but I see that you want something different lol hmmm you could try shredded newspaper
OR you could buy your daugher
a ball pit LOL I would love to get my ferrets a ball pit ! I have a few of those plastic easter eggs, other critter balls and jingle balls in a box for my lot although Rocky is only interested in how many he a can steal and stash.