In particular, she likes small pieces of paper. To detail more fully, she likes to create small pieces of paper. And the thing about paper is that you never know when you are going to need it. So you don't want to waste it.
We have fought this battle for the 7 years since she first picked up a pair of safety scissors.
"Emily, clean your room."
At which point Emily stays quiet for 10-12 seconds before saying: "Its finished".
"NO Emily, I want you to put your stuff away."
At which point, Emily realizes that her parent was talking to her, and she takes 3-4 items nearest to her and stacks in a corner somewhere (anywhere, really).
"NO Emily, I want you to put all of your stuff away, and put the trash strung throughout in the trashcan."
At which point, Emily realizes that someone is actually going to review her progress before some significant event is to occur (dinner, for example). She is motivated finally to do her collective best.
A short while later, said parent ventures in to find things reasonable, excepting the life-force of Emily's creative existence: paper.
She doesn't pick it up.
It isn't 'toys', so she doesn't have to put away.
It isn't 'trash', so she doesn't have to throw away.
It is time to define a third category. I'm happy to accept suggestions.