$10.79 @ Amazon. You can probably get it for $6-7 from random book resellers on Google. If you approach this book with discipline, the return for your $ will be immense.
If you don't have a copy yet, pick up Stick Control. It will keep you busy for quite a while.
They mean this.
I recommend delaying your purchase for enough time to get a Roland TD-17KV (they are $1,200 on Sweetwater). In the mean time, stop by a local music shop (or hit Amazon) and get some sticks, a practice pad, and a copy of Stick Control. She can work on her rudiments and start playing along with you. Once you can afford the kit, she'll be further along and can start incorporating toms, cymbals, and her feet.