She would have had to cross the highway to get back to the gas station
A stupid continuity point, but just thinking about it, she would have had to cross a road at some point to get back to the gas station just for positioning reasons.
ie the gas station is on the left of the highway (when driving away from the gas station) and they turn off the highway to the right of it.
Not really that important but sort of strange.
But I'm still not 100% clear on the whole movie!!