It's a small book, very concise and well written with a wealth of material for beginners and self taught artists. Part of the difficulty in self teaching is filling in gaps -- this volume covers the basics well and more than that, gives challenging ideas and ways to use less expensive materials and pastels for someone who wants to take up pastel but doesn't really have the cash to go getting a large set of Unison or Sennelier. A pad of Canson mi-Tientes and a 24 color set of pastels or pastel pencils would be enough to work with what she's got for projects.
The sheer amount of information covered is wonderful. Also since it's geared to thirty minute art, the book's very good for encouraging sketching and drawing fast and copious. You could have fun with this with a sketchbook and a set of 12 color Conte or Nupastels too.
Oil pastel techniques are not covered, for that you'd want Bill Creevy's "The Pastel Book" which has a lot of information on using oil pastels.