Elizabeth:
Thanks for coming to the Disney Parks Moms Panel!
Let me suggest that you go to the official Disney World website and look at the list of Magic Kingdom attractions
here and the Animal Kingdom attractions
here to find which attractions she will be tall enough to ride. You can either choose the height requirement that she meets up at the top of the page, and it will give you all the attractions for which she's qualified or you can simply skim the list and look at the individual height requirements for each ride.
Your daughter will need to be at least 38 inches or taller to ride the
Seven Dwarfs Mine Train at the Magic Kingdom. HINT: This new ride is extremely popular with guests. I would recommend getting a
FP+ for it to avoid the long standby lines. Disney Mom Jodi went to its Grand Opening the first week of May and can answer any questions you might have about it
here. Wishing y'all a magical vacation!
Whitney