There is no need to bring a note. (Sometimes I wish there were such a requirement.)
You may be better off renting an
ECV, as pushing a wheelchair can get very tiresome, especially if you are not used to it. Also it depends on the weight of the passenger and the condition of the pusher(s).
Also, use of an ECV will give your mother more of a feeling of independence than being pushed in a chair. Note that most large grocery stores, and such stores as Wal-Mart, usually have
ECVs available for customers in need to use. Your mother can use one of these for "practice", realizing that the ones in the stores are much slower and nowhere near as maneuverable as the park or off-site rentals.
Some information for off-site rentals are:
Walker Mobility:
888-726-6837
www.walkermobility.com
Care Medical:
http://www.caremedicalequipment.com/
407-856-2273, Toll Free U.S and Canada (800) 741-2282
Randy'S Mobility is in Kissimmee
http://randysmobility.com
407-892-4777
Colonial Medical
http://www.colonialmed.com/about_cms.html
800-747-0246
ScootAround
http://www.scootaround.com
Toll-free, US and Canada 888-441-7575
I have used Walker a few times. They will ask for a credit card and charge it the day before arrival. All of those listed, except Randy's, will deliver the ECV to your hotel bell services before your arrival and pick it up there after your departure. Their rates, especially for longer than a week, are much better than Disney's. Also, their scooters are much better.
You don't say if you are renting a car or what. If you are using a car for getting around, the ECVs break down into five pieces, the heaviest about 39 pounds. They take about a minute or so to take apart and about two minutes (once you are used to it) to put it together.
Another suggestion is find out your state's requirements for a temporary disabled hang tag and get the paper work and have her doctor sign off on it. The tag will allow you to use any of the handicap parking areas (which will be a necessity). Also, with the policy of charging for valet parking, with a handicap hang tag the fees will be waived. Also the valets will usually volunteer to assist in loading/unloading an ECV. In Virginia I printed the required form from the DMV website. When I took the completed form to the DMV Office it took less than 15 minutes from the time I walked in until I had my tag.