litter box hoarding?

So my baby is doing so well with her new huge litter box and fleece lined floors.... but i come home tonight and she's taken to bringing one of her new pieces of scrap (a glove at one point) into her box. As i was cleaning it out i noticed half of one of her chews in there too. And as i type, she's sitting in her poop box, eating a piece of her lab block.
How can i discourage this? She was being so great about using it just to do her business!