How Easy Is It For A Hanicapped Person Go To Disney World???

My mom wants to go to Disney but she’s disabled. She can walk, but is very limited. She doesnt have a wheelchair. Does anyone know:
Where can you rent a motorized scooter? At the value hotels? Do you take it on the bus and to the parks or do you have to rent on at the parks? Can you go on the rides in a wheechair…i mean she cant stand in line, but could get out of it and get onto the ride. Where does the scooter go when she’s on the ride?? I never noticed handicapped lines, do they exist? on all rides? How much does it cost to rent a scooter? Can you ride it onto the monorail? The only way my mom could go is if she rented a scooter so she has it all the time. I have NO clue!!! Please help, i would like her to come to my wedding!