I really appreciated Jon's position on this, because I too was thinking about things from the buyer's perspective. I didn't know about the cashier's check scams until I read this thread, and like your buyer, I wouldn't want to set myself up to get burned, either.
That being said, 10 hours away? She should take a day to drive over and take care of this. I know you expressed concern about the Bronco making the trip, but that's up to the buyer. She could bring a trailer or even a friend just to follow her back... either way, it's part of the adventure!
Best of luck to BOTH parties...!