She could probably use acrylic paint on fabric (quilting weight fabric) then heat set it with a hot iron and a good bit of ironing. Try a sample first of course.....also, have her try Pentel's Dye Sticks which smudge and blend into lots of beautiful effects, just like pastels. AND-----they are very inexpensive. Under $5 for a box of about 15 colors. I buy them online at Dick Blick since the big crafting retailers around me don't carry them.