I'd actually suggest, any good tutorial on the net ; pretty everything that you need is there, just need to google it there.

You'd be surprised at how much resources there is online.

Honestly, buying books as introductions seems useless to me besides the fact of that buying the book might actually push you more into the actual programming act.

But for her to start, the best would really be to pick tutorials that not only relates to her future use of the program but also to what interrest her. Because, after all, she probably won't be programming websites or wordpress themes.

Quick googling for "math related python tutorial" got me this :) http://showmedo.com/videotutorials/series?id=101

seems pretty cool intro.