My electric scooter fits in my Tiguan as it folds up quite small.
Sometimes i have pushed the rear seats forward for a bit of extra space for luggage too.
But usually it’s not necessary.
If I were you I’d take her buggy along to any test drive and see how easy it is to put in the boot of what cars you’re interested in.
The other thing I’d say is you could always add another friend or family member as the driver until you pass.