conuly

If she's zipping through the workbooks so fast, perhaps she needs more challenging workbooks, or some interesting interactive sites online, since those don't cost anything.

LOL, I was a reader-ahead of read-aloud books, because having to wait for someone else to get on with it was just annoying, when I could read far faster and longer than they could talk. As long as those who read ahead keep their mouths shut about spoilers, it ought not to be a problem. Some people just process text a lot more easily than they process verbal speech.

I highly recommend Lloyd Alexander's Chronicles of Prydain, Susan Cooper's The Dark Is Rising series, and the 'Green Knowe' books, the aiuthor of which I'm not recalling. Also The Enchanted Castle and Five Children and It by Ellen Nesbitt. Your girlies are probably still a bit young for The Hobbit or The Once and Future King, but it won't be long before they're old enough.