I'd go to a used book store and look at the available text books and also check out a home school supply store for the same. See what she likes then start working through it.

Your end goal is to get her to begin Algebra, so finding a canonical curriculum that you can stick with would be a plus. Perhaps a two-book series, one being pre-algebra and then algebra.

You could also look for a geometry text. Geometry can be a lot of fun.