If she's anything like my DDs (7 and 5), she probably has lots of "collection" type toys. We have tons of LPS, Ponyville, Polly, Barbies, etc. We do have a toybox, but you can't just dump those things in a big box, or they have to empty it to find the one thing they're looking for.
DD 7 has one of those large 9-cube shelving units in her room, with fabric bins to organize smaller toys. Larger pieces go on top, and she has a big laundry hamper for all her stuffed animals. We just put shelves along the side wall of DD5's closet. I bought the sterlite "showoff" boxes that have latching lids with handles. She can see what's inside, there are different sizes, and the handles make them easy to carry to a different room. The boxes were in the $1.50-4 range at Wal-Mart, so much cheaper than fancy baskets. It's still not a perfect system, but it seems to be helping a little around here!