SUMMARY: Everyone needs a hobby.
Boost seems to be collecting apples from under the apple tree in the back yard and storing them in strategic locations around the house. So she'll have something to eat in case of the zombie apocalypse, I suppose. Or, if not that, they make perfectly good toys to roll down the hallway and chase.
"Hmm--it round, it red, but it no taste like yard fruit ball. Hm. Taste like master gamble Q. Hmm."