Welcome back to the Disney Parks Moms Panel, Danny!
What an exiting opportunity for your special dancer. I have a competitive dancer myself, so I know how much fun opportunities like this can be, especially when they are at Walt Disney World® Resort.
Bus transportation from Disney Springs does not operate to the theme parks, only to Walt Disney World® Resort hotels and to serve as a transfer point for Disney's Typhoon Lagoon Water Park. Buses going to/from the Resort hotels usually begin arriving at about 9:30am as Disney Springs' hours are 10:00am -12:00am. Transportation from the theme parks TO Disney Springs does not begin operations until 4:00pm daily. You can select the highlighted link above to read about Disney Springs' one-way, after 4:00pm transportation option.
If you have a personal vehicle, your best option is to park at Magic Kingdom and drive to Disney Springs at the appropriate time. You could always consider utilizing Disney's Ride Sharing Service, operated through the Lyft App, Minnie Van Service, but at $20 one-way, you're better off parking at Magic Kingdom.
I hope this is helpful planning your day around this very special experience. Please do not hesitate to reach out to me with any additional questions you may have, Danny! I am here to help.
Faith