Now that I've looked at their website, I'm seeing that the summer classes run until December, so that probably won't work for her since she'll be starting school in August. Would it be worth just getting the book or would there be another better way to make sure she's prepared going into high school geometry? I actually think she might like geometry better than algebra.
While she learned quadratic equations this year, it was more rote memorization which seems to make it hard to internalize the steps b/c they aren't personally meaningful.