True, unless she left it at the hotel, or in a manic state she forgot it was in her luggage or something like that.
I know I've driven all the way back home before for my laptop and badge, and it was in my vehicle the whole time!
My vehicle is a 2020 and there's a charging station. I just put the phone in it and it charges without any type of plug-in cable. It automatically connects to hands-free use. Furthermore, a tech person should normally check that she had all her tech stuff when she got in the car.
I can't think of any reason why her phone battery would not be fully charged if she was driving.