Hello Jennifer and thanks for visiting the Disney Parks Moms Panel with such a great question.
I'm overjoyed to know you're planning a visit to Walt Disney World Resort with your brave warrior Princess to celebrate completion of her radiation treatment and am quite sure that an extra dose of pixie dust will no doubt aid in her recovery.
To assist your darling daughter you may wish to consider
Wheelchair Rental or
ECV Rental whilst touring the Disney Theme Parks. Wheelchairs can be rented at each Disney Theme Park or at Disney Springs on a daily or length of stay basis and this
Services for Guests with Mobility Disabilities link provides some great information on access for Attractions.
I believe you might benefit from the
Disability Access Service Card DAS. Guests who are unable to stand or wait in conventional lines can apply for a
DAS from any Disney Theme Park
Guest Relations. No medical proof is required, just a chat with a knowledgeable Cast Member who will be able to advise further.
It may also help to know that each Disney Theme Park also has it's own
First Aid location where you will find a nurse on duty during normal park hours.
If I can help sprinkle any extra pixie dust onto your plans to visit Walt Disney World Resort please do pop back to ask me another question.
~ Jane