Puzzle Pile-up

Among all the messes that I have to clean up, this is BY FAR the worst of them all.  It makes me completely cuckoo.  I have no idea how she manages to accomplish this without us knowing.  And why on earth does she find dumping all the puzzle pieces into one pile so entertaining.  I will never understand.  As I've said 1 billion times since she's been born, "It's a good thing she's cute".