Our daughter had a whole lot more than 9 Barbies, so we purchased a a rolling 3 drawer organizer. That way it could roll out of her closet and back into the closet. She kept the Barbies in the drawers along with containers for the clothing. all very organized.. She loved, organizing it over and over.
I also purchased a 60 drawer Plastic cabinet.. Usually they are at the hardware store to store nails, screws, washers etc..
She kept it very organized with a drawer for high heels, drawer for sandals, for wedges, for casual handbags, hats, crowns, jewelry, Kens casual shoes, socks.. etc..
The fun thing was you could point at a drawer and she could tell you what was in each drawer! Like the memory game! any time I found some small piece of Barbie stuff, I just placed it in her room in a small bowl on her dresser and she would place it where it belonged..