We used one last year with a standard (balcony) room and it was fine. We DID move the "coffee table" out onto the balcony (at the advice of the stateroom attendant) so we'd have room to do a 180 in the room. It's WAY easier to go forward through the door coming and going. We had room for one of us to sit on the loveseat with the scooter out of the way. You can reach out to special_needs@rccl,com and they can help you with specifics for the ship/room she'll be in. We rented from Scootaround and their "standard" scooter is 21" wide and fits just fine in NON-Accessible rooms. If she has assistance opening the door, etc, she can probably get by with a standard room. Accessible rooms (may?) have electric openers and be laid out with more room to navigate, especially the bathrooom.