I'll put in a plug for his book Theory of Fun for Game Design (https://www.amazon.com/Theory-Game-Design-Raph-Koster/dp/144...). It's a great read that's accessible but also deep and thorough.

As far as creative books go, I want to share "A theory of fun" (https://www.amazon.com/Theory-Game-Design-Raph-Koster/dp/144...) - it's a game design book very accessible for an .. let's say 8-10 year old, might still be a bit early for your daughter depending on her level.

About to start A Theory of Fun for Game Design.

http://www.amazon.com/Theory-Game-Design-Raph-Koster/dp/1449...

I have no interest in making games, but this comes highly recommended to understand applied intrinsic motivation (which I am very interested in). Grabbed it from the worrydream book list.

http://worrydream.com/#!/Links

Well don't forget to read the part where I split it into three tasks - the web part, the game engine part, and the game design part. For game design, I highly recommend A Theory of Fun for Game Design [1] and the column Making Magic by the head designer for Magic: The Gathering[2].

[1] http://www.amazon.com/Theory-Fun-Game-Design-ebook/dp/B004D4... only $4 on Kindle or $12 on paper

[2] Look for the ones he gives 4 and 5 stars. WARNING: Lots of reading