[Cozumel]

Maybe teach her how to make a Wordpress plugin? It'd slot in with what she already knows and she'd see immediate benefit as well as a real life application of her code.

Learn Python the hard way is a great idea too though, I got my friend started with the Ruby one and she really took to it. Another good one for Python is http://automatetheboringstuff.com/

Something to watch out for though is a lot of books are hopelessly out of date, code moves so fast that all the code examples in a book even just a couple of months old will be broken. Trivial for experienced people to workaround but typically if you're reading the book to learn you won't be able to figure it out.