Just my personal opinion, I would try to avoid either of those unless your girlfriend is very invested in the experience of the trip and outdoorsy. A lot of the drive is pretty monotonous- I would definitely not call it the most scenic road trip in AK. The Brooks is a different story, but a small percentage of the distance you'll be traveling.
Don't think I'd go so far as to say solo is high risk, but you're definitely only one compounding factor from things getting weird. Vis can go from a lot to nothing very quickly, and everyone knows the terrain lends itself to injuries. Few miles in on a stalk and both of those happen your way... be good to have a buddy. At very least, "two is one" on your satellite messengers.
In either case, good luck and have fun!