I don't know how she did it, but the solution I've seen was to attach a spinner knob to the wheel. Cheap and easy to do. And gives mobility to somebody who otherwise wouldn't have it

"suicide knob" is a classic device I've seen before. They were popular in the 60s or so. Named as such because they had a knack for snapping off. It's still in use for people with various disabilities. However, it's not especially hard to steer with one hand. I probably went 4 years after the driving test using only one hand with a palm spin. But then I got a car with a slightly slicker, heavier steering wheel and it didn't work so well.

It's perfectly possible to drive 1 handed without any special setup. I do it regularly. You just need an automatic (non manual) shift.

It’s possible to drive without legs. It’s easy to drive with one hand. I’d wager it could be done with more skill than many drivers exhibit with only one limb.

Don't you need both hands to steer properly?

Do you drive? I basically use only my left hand while driving. And my car is an automatic EV, so I don't have to shift. Also I'm right handed.

I dunno. It's just comfortable. It might be a remnant from when I used to drive manual shift, when I had to shift gears often, driving in the city. You definitely don't need two hands to steer, though. And her stump could definitely do shifting no problem.

My husband has cerebral palsy and so one working hand to steer with. As others have said, he used the 'suicide knob' to drive, except it was like. Installed professionally and he legally had to have it installed to drive. I'm unsure if there's other ways, but that's how it was done here.

I had a good friend who's dad had no arms, and he had his driver's license and was an excellent driver