Lily and I have finished another page!
I think I have it all figured out how to not lose her interest through the whole process. I have her pick out our paper and our scraps, the pictures and the stickers, and then I give her another page with throw-away pictures to use. Then she happily glues on her page while I assemble the final page for the book. Here's pictures of the finished book page, and then the page that lily did (that she wants to keep in her room... her words exactly)