Be a gentleman and offer her to stay with you for the night

"It's honestly late in the night," you interrupt her cycle of indecision, "would you like to stay the night at my house?"

Her eyes open wide, she stammers for a while and you wait patiently until she recollects herself enough to form a coherent sentence.

"I don't want to intrude," She says, "I was just-"

"You were just about to try and ask me to take you back down," you interrupt her. She nods at this and you continue, "but that would be more of an intrusion for me, because all I want is to get home. If I take you back with me then we both get to sleep soundly at night."

By the look on her face you can tell she's tempted, she shifts her weight from one foot to another as she considers it. One more push, then.

"It'll be good for you too, since I won't have to treat you as an intruder but my guest."

"An intruder?" She asks, a little surprised, "But this is a public road."

"Not quite," you tell her, "this mountain is my property, and I had this road built for my use. I'm honestly surprised you weren't stopped at the base of the mountain by a guard."

"I did notice a guard," she admits, "but he didn't notice me."

You raise an eyebrow at that, and give her one of your charming smiles.

"Then that's settled," you tell her in no uncertain terms, "you're my guest."

You reach over and open the passenger side door, and she looks unsure for a moment before visibly inhaling a deep breath to steel herself. She sits down next to you and closes the door behind her, but makes no other move.

"Best for you to fasten your seat belt," you say, "it's going to be a rough ride."

"A seat belt?" She asks and gives you a quizzical look, "What do you mean?"

Oh come on, you think, you've never rode on a car before?

You'd ask, but you feel like you know the answer already, and it would be quite rude to the girl since she seems quite sincere.

"It's for your safety when riding a car," you tell her, "watch what I do."

Without missing a beat, you reach over and pull on the belt buckle, while surreptitiously leaving a hand on her chest as you fasten it for her.

"This is for you to not fly away in case of a crash." You finish. She looks at it and nods to you that she understands.

Holy shit, you think, I've met the most naive person in the world.