Thanks! She's not super mathy, or rather she's not much for the rote skills and repetition of early math. I ended up deciding to start her on 1b as it seems like she's got a few important sections entirely missing, things that are not just a quick "you didn't get what this question meant because you haven't seen it expressed this way before". I suspect we'll rip through it, but there's no rush. Also the books aren't that much in the end.