and if I can do it anyone can do it. The good thing about Disney is you are not pushing the wheelchair non stop. You go a little with the wheelchair and you see a show and rest. You go a little more and you stand in line for a ride. Then you go so more and rest and see a parade. Then you go and eat and rest so more. Finally, you see fireworks and rest and then go back to the resort. You get the idea. I don't think I've ever done more than a half hour at one time with pushing the wheelchair non stop. I think it's more like 15 minute intervals. I will say it would behove you to alternate activities ; so, you can have rest periods built in. AK is probably the hardest park as the other poster said. The terrain is rough, it's the largest park and there are inclines there. I always eat well at Disney including desserts and I still come home losing weight pushing a wheelchair.
Make sure you use all ramped sidewalks and don't run off a curb with a wheelchair. Take turns if there are others who can help push it. You will be slower than just walking around the park; so, everyone has to adjust some to the speed of the wheelchair. Don't make it seem like a chore to do this for your mom; make it feel like an honor to be pushing her.
Now, if your mom drives she may be okay with a
scooter. It would be faster with a scooter. She can try out a free one at your local store like Wal-Mart or Target, etc. She may need help with it on and off the bus. It is very hard to park the scooter in the right place on the bus. There's too many twists and turns to get it into the right area and it's tight quarters to do it on the bus. The good thing is you get on first with a scooter or wheelchair, but you do get off last. You may want to consider
renting a scooter at the park and then you don't have to charge the battery and you don't have to take it on and off the buses. It does cost almost double to rent from Disney as oppose to an outside rental company for a scooter. You would have to make it to the parks from the resorts and vice versa by walking if you rent from the parks. Sometimes, you can find loaner wheelchairs in the parking lots, but they can be hard to get and find and they're only meant to get you back and forth from the parks to the parking lots.
It is very crowded at Disney and you can't judge using a scooter at home with one in the park. People will dart out in front of you at the parks and you have to be able to stop or move away very fast with the scooter. Also, many ride queues have twists and turns and you have to handle that aspect, too.
You may want to do a practice run at home with a scooter and visit a zoo; many zoos rent them. It will give you some idea of how it is to use one in a park.
I like to rent from Apple Scooters. They do wheelchairs, too. They are among the most reasonable in price and they have given me good service.