Do all cars come with a trip planning feature? IE, if she had rented a BMW or Volvo, would she be able to use the Tesla app or similar?
From my perspective, people are used to being able to pull off the highway just about anywhere and fill their tanks. Having to plan everything down to the mile, even for a mostly highway trip through populated areas, is a major change of thinking.
For example, take this trip...
https://www.tesla.com/trips/#/?v=MS_2017_100D&o=Reston,%20VA...
In my ICE car, I usually stop in Richmond or Williamsburg to get a snack and use the restroom. Based on Tesla's app, I now have to stop twice (once to pee, again to charge). And that second stop is longer than a 5 minute fuel fill. Not the end of the world, but different. Also, there is no charging station at the destination, so I now need to manage my mileage while at the beach to ensure I can get to the closest charge 10 miles to the south (which then adds time to the start of the return journey). Again, not an insurmountable obstacle, but it sure does add complication to a trip I make several times/year with a car full of family and pets.
Edit - I'm not trying to be snarky or difficult. I really have no idea how people plan their EV trips, as I don't own one (and probably can't any time soon, as I don't have a dedicated parking spot to install a charger at home).
Edit2 - if I change the charger routing to the smaller battery pack, it recommends two stops, adding even more time. This would likely be the case for any EV except Tesla, or possibly a Bolt?