Mag Chalkboard Paint: Paint a wall, have some craft activities to have her make castle/house/outdoors/etc pieces (modular ideas so she can build the castle in many different configurations). Also could use chalk to outline and draw.
Create a hidden memo board inside a pantry door for a handy place to record your grocery list and calendar. All it requires is a few coats of chalkboard paint. | Photo: David Still/Beautiful Kitchens/IPC + Syndication | thisoldhouse.com