Hello Adrienne! Your little princess is not alone in her adoration of Sofia the First! Your question is a very popular one here at the Moms Panel. As you already know, Sofia can be found in the Disney Junior - Live on Stage! show at Disney's Hollywood Studios. This show takes place several times throughout the day, so you should check the Times Guide. Disney has also announced that Sofia will be doing Meet & Greet appearances with all of her little fans very soon, also at Disney's Hollywood Studios. While an official date hasn't been given, they are saying "late summer", so hopefully she will be ready by the time you and your family arrive for your Walt Disney World vacation.
As far as toddler-friendly rides, there are many options for her. Unless a ride has a height restriction, she will be able to ride with you, either on the seat or on your lap, for most rides at Walt Disney World. I'm providing you with a link to
rides at Walt Disney World for any height, so you can have a look ahead of time to see what you will all be able to enjoy. I hope this helps!
Adrienne, thank you so much for visiting the Disney Parks Moms Panel to ask your questions. I would be happy to answer any other questions you have before your upcoming trip - just write me back and ask! Have a magical day!
Kristen