I find for my daughter (and son)--my daughter is the same age as yours--that this problem seems to always be worse when she has too many clothes to fit the space to store them. So weed out things. Or provide more storage. My daughter is pretty good about putting things in the drawers they belong in and hanging up what needs to be hung up....but only if it fits. When there isn't room to put the pants/shorts or whatever in the drawer neatly, it tends to get stuffed in. And the drawers don't close.
That's my clue it's time to weed. My problem is more that my daughter receives a lot of handmedowns, and she never wants to not keep any of it. Not that her clothes are outgrown and still in the drawer anyway.
I think if I were more proactive about sorting/weeding out old/too small clothes, though... like maybe 3 or 4 times a year (instead of once or twice-winter/spring) that it would make the problem at least less significant.
I'd have your daughter spring clean. Pull out EVERYTHING from the drawers and closet and start over. Try on anything that hasn't been worn in the last 2 weeks. Make 2 piles: fits/doesn't fit. The fits stuff needs to be re-hung/reorganized into the current storage space. If it doesn't all fit, you'll know you either need to have fewer clothes, or more storage.
hth