I really would look at Pinterest--there are some fantastic art teacher blogs out there. You can easily do your own private art instruction for free. Materials do matter. Get her some good colored pencils, decent brushes, small canvases, some watercolor paper, inexpensive tube watercolors, oil and chalk pastels, and acrylics if she can be careful (they stain). Children's materials are usually awful, so look at inexpensive adult materials.