Walt Disney World has an Assistance to help guests who need assistance tour the parks. The way this program works recently changed. You will need to visit a guest relations location in the parks to pick up a card for your sister. Once she has her card she will be issued a ticket with a time to enter an attraction, based on the current wait time when she can return with you and other family members to ride. She won’t wait in the line, but she somewhere else for an equivalent amount of time to the current wait. Depending on her needs there are special ride vehicles at some attractions to accommodate wheelchairs, and there may be an alternative entrance. Details will be given when she gets her disability access card.