My advise is to have your mom practice going forwards, backwards, at the resort before heading to the park.
Have her practive parallel parking, backing into a space. GOing backwards and getting the
scooter to go straight is difficult for some people. THats one to practice.
Some of the busses you have to back up on the ramp. Then once up the ramp, the bus, lifts you up. Then you back up, and make a hard turn to park the scooter.
Other buses you go up the ramp forward.
If your mom isn't comforable, and she can get up the stairs of the bus ok, someone else can park the scooter instead. At the beginning, sometimes I had my hubby do it for me. Sometimes I just couldn't park at all, and was off, so my hubby did it. Plus, if your off just a little, you can go forward and backward, just like you see people doing when parallel parking until you get
into the spot. Sometimes to help you out. Not always, when your a little off, the bus driver might scooch over the back of the scooter to help you park, or put it in manual, and get the scooter into position.
I've been on several
ecv trips, and am doing great at parking on the busses now. It is a little bit difficult at first.
Things to remember, you have to have your speed up to get up the ramps, however once your up the ramp, turn your speed down. When your moving in closed quarters, you can get better mobility when moving slow.
Same thing when your stopped in lines for attractions. Turn your speed down. Its good for the person sitting so you don't give your self whiplash, by the quick stopping and starting that goes on when in a line.
You'll be fine with disney transportation, we only drive when we goto DD because sometimes we buy to many things, and need a place to store the loot, while we continue shopping.
Your mom will be fine in the scooter, just be patient at first when parking.