For *very* easy reading, my dd enjoyed the "Adventures of Otto" books by David Milgrim. The first one is See Otto. There is also Ride Otto, Ride and Swing Otto, Swing, and I think one or two others.
As you can tell from the titles, the content is a little "Dick and Jane"ish but Otto is such an adorable little robot and the books are really pretty funny in a simple sort of way. At my library they were in the "Easy Reader" section, which is arranged in an odd sort of way, making specific books kind of hard to find. You might have to ask a librarian for help if yours is the same way.
For slightly more advanced reading, I second the recommendation of Little Bear and Frog and Toad. Actually just about anything by Arnold Lobel is good. There have been others she enjoyed at that stage as well, I just can't think of them at the moment! Congrats to your dd on learning to read!!