RSBM
Speculation only - what if she drove the rental 900-odd miles and flew back into CS Airport to collect her own car?
I haven't rented a car in decades but wouldn't the receipt show an extra charge if she dropped the car off at a different place than where she rented it? (Think the receipt originally showed it was rented in CS.)
Also these days it's pretty hard to fly so "secretly" LE won't find out, isn't it?