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.
Color Mixing on Coffee Filters- Primary colors are one of the first art concepts I like to introduce young kids to in art. First, because they are a basic building block for for understanding how to make all kinds of things. And second, because mixing colors is kind of magical. Color mixing on coffee filters is a fun introduction to what happens when those primary colors mix together!