Hi there, Kristi!
Disney strives to accommodate all of the needs of its Guests, from dietary to mobility and more.
Before you arrive, let a Cast Member know that you'll require one of the 13 accessible cabins. Try to do that well in advance to give your traveling party the best chance of having that request honored.
It will be easy for your mother to negotiate some of the Resort options; for example, she will be able to power on to the ferries and monorails without having to leave her chair.
Buses at Walt Disney World - and bus will be your primary mode of transport in and out of Fort Wilderness - are certainly equipped to accommodate any chair that fits on a standard bus lift (32"x48"). A maximum of two unfolded wheelchairs/power chairs are permitted on each bus. Bus drivers will assist in boarding.
The boats are going to be more of a challenge, but with patience and a bit of planning, you can manage to avoid them altogether. The only direct boat trip you might need to take is from Fort Wilderness to the Magic Kingdom. Two Motor Cruisers (Green Flag) run from 8:30am to approximately one hour after the Magic Kingdom closes. Motor Cruisers can accommodate most power chairs unless water level in the lake is too low. Your captain will be able to tell you that. It s rare that the water is too low.
Gold and Blue Flag motor launches are
unable to accommodate power chairs at any time.
Add a bit of time into your schedule, and use the buses. To get to Magic Kingdom, take an internal bus or walk to the boat dock. Head over to the Settlement Bus Stop and take the bus to Wilderness Lodge (or walk/ride the paved trail that goes over to Wilderness Lodge). From there, you can take a bus directly to Magic Kingdom.
If I can help you plan any more routes,
drop me a line.
See you later, celebrator,
-Deborah B.