The normal and official Guest Relations response to a nobility and/or stamina problem is the suggestion that the Guest rent a wheelchair or
ECV.
A letter from a doctor is basically useless. Not only is Disney legally prohibited from asking for one, but there is no way to prove that the note is legitimate in any way.
First of all, pick a place about a mile from where your mother lives and ask her how difficult it would be to walk there. After a short pause, add "and back". Then after she answers, say "four times in a row".
Then she will give you a look as only a mother can do to a child which implies "Are you out of your mind". Explain to her that most people tend to walk 8-12 miles per day at WDW. Once around the Epcot World Showcase Lagoon Promenade, is about 1½ miles. And that is without actually entering any of the pavilion areas.
Please ask her the following questions. Here are the suggested answers to go with them.
1. Are you disabled (even temporarily)? Yes.
2. Do the people you are traveling with, such as your family, know you are disabled? Yes.
3. Do you expect to meet anyone you know during this trip who may not know you are disabled. Probab ly No!
4. Do you expect to meet a bunch of people who you will probably never meet again in your life? Probably yes!
5. Is there any reason at all that you should care what these people think about you? Absolutely No!!
6. Will using a wheelchair or ECV make for a better vacation for you
and your family? Absolutely YES!