Soil Sifter, Wide Size (17.5 x 11.5 inches) with 1/4-inch Mesh, Garden Sieve for Dirt, Sand, Rocks, and Compost

Perfect. Since you’re handy, you could create under storage bins with matching wood or composite frames for her storage. I’d make a sifter type bin like this for water to escape. https://www.amazon.com/Wenses-Large-Soil-Sifter-Gloves/dp/B0DDNQ8NKP