If she likes to draw, how about some watercolor pencils and paper,and a couple decent brushes? They can be used three ways: the watercolor paper can be soaked beforehand, to make the pencil colors brighter; the pencils can be dipped in water for dense color; or the color can be applied to dry paper, then gone over with brush and water. I love using these materials with kids, because they're usually pretty responsive.
Another idea would be going to a 'paint your own pottery' place for a special time with you, painting a mug for her to use, and offering her a box of herbal teas.
A couple bags of Sculpey, which can be dried (oven cooked?) to harden and comes in a range of colors.
I don't think I saw pattern blocks in the posts, but I know that kids this age do like to experiment with them. Some sets come with cards that show different block arrangements, some don't. Kids will know what they want to do with the blocks, anyway.
You've got a lot of other good suggestions. I'm sure something will work!