The Eyes and No Eyes series by Arabella Buckley is really good, but it’s a series of books, and not just one. I’d pick a few of these (one per term) and add in some nature study. Like Tristan said, there are so many good choices for science! If you don’t already have the Handbook of Nature Study, it’s a wonderful book. It’s written for you (the mom) to share some of the information and gives lots of questions to ask them. Both of these resources are in the public domain, if budget is a concern…although the Handbook of NS is about 900 pages, so I wouldn’t recommend printing it all out!
For history, something like Story of the World would be a good choice. Or one of the Guerber Books like The Story of the Thirteen Colonies. There are lots of other good choices here too! I’d want to add in some living chapter books for this age as well. 1-2 books per term. These could also count toward literature.