You might want to look in to renting an
ECV instead of a wheelchair. The rental wheelchairs tend to be pretty heavy, and are not easy to push for 6-8 miles a day (an average estimate for park guests) in Floridian heat. Also, she will be more independent in an ECV, as she probably won't be able to push herself all around the parks in a manual wheelchair.
If you do look in to this option, I suggest you rent one from an offsite vendor, so she can have it for the whole trip, including around the resort and DTD. Also, it tends to work out cheaper than the Disney rentals, and they are A LOT easier to drive than the heavy-duty Disney ones. Pretty much all of the companies will deliver to, and collect from, your resort, and the ECV can be taken on Disney buses. For more information on any of this, look in the FAQ thread.
You can park
ECVs and wheelchairs with the strollers, if she doesn't want to take it through the line. If it's an ECV, just take the key with you, and nobody can take it. Cover the seat and handlebars with something, to stop them getting wet or burning hot while you're in the attraction. Don't panic if it's not in exactly the same place when you get back - the CMs will often move things around a bit to tidy the stroller park up, and make room for more people.
Cheshire Figment has a wonderful list of questions for people who are reluctant to use mobility aids in Disney; hopefully he'll post them up soon. But in the mean time, please tell her that there is no shame at all in asking for the help you need. I'm 23 and have been using a wheelchair for the last 3 years for joint problems - I know how much of a big deal it is, and how much it takes to get your head around the idea, but asking for help doesn't make you weak; it makes you stronger. Sorry for sounding a bit like a Hallmark card, but I really do mean it.
Hope you guys have a great trip, whatever you all decide to do
