Welcome to the DIS!
Because of the height requirements you will have to skip Space Mountain, the Indy Speedway, and probably Big Thunder Mountain Railroad. If she's over 40", she could go on Splash Mountain. Unless you get there right at opening, skip Dumbo. You can go on the Magic Carpets and Astro Orbitor for the same effect and much less of a wait. I'd probably skip Pirates of the Carribean too and even Haunted Mansion. Those might scare her, along with the Stitch Ride, as the other poster said.
Start out in Fantasyland to make sure you get the highlights done. Get a fastpass for the Pooh ride and then do the others. Mickey's Philarmagic is a fun movie. If there's a wait, you can fastpass that as well. You could also skip some of the show type attractions: Timekeeper, Carosuel of Progress, Hall of Presidents, and the Country Jamboree. If I only had one day, I'd skip Tom Sawyer's Island and the Liberty Belle Riverboat ride.