We took a similar approach to geofizz's, remediating spelling because that seemed to be the main gating item limiting access to other skills and content. My kid was fairly far along in AAS when AAR was released, so we haven't used AAR (other than the casual way #1 is using it to play school with #3). There is a pretty decent correspondence between the two of them, with Level 1 of each covering essentially the same phonograms.
My inclination would be to stick mainly with AAR as long as she is eager to do so, since time is scarce. Maybe you could start with AAS in the summer, when you won't have as much competition for time from school. You'll probably blow through the first level or two quite quickly, by that time, given a nice solid foundation in reading.
You could also check on the All About Learning forums. They are not very active in the back-and-forth way this one is, but their product support people are very responsive, and speak from personal experience homeschooling with the products.
