All I can suggest is to walk around some used car lots and look for cars with the transmission lever on the steering column. I’m pretty sure you’re going to be limited to domestic makes, but maybe not. I think Mercedes has some sort of high-tech transmission selector on the column.
I’m sure you’re looking for a car with an automatic transmission, and not a true “three on the tree” manual shifter.
My Ford Ranger pickup has a shifter on the steering column, but I doubt your mother wants a truck.
Good luck and happy hunting.