First, we took everything out of her closet, got rid of clothes that did not fit or that she was not wearing. Then we put it all back, using containers that held one type of item — sweaters, tops, and so forth.
If you go back and forth between the before and after pictures, you can see she had the correct containers, but was not using them correctly.
I’ve discovered that kids love order. All they need is a little help to combine good organizing principles with their own personal goals.