That much paranoia sounds healthy to me. It is exactly what I would tell my kid when he's old enough to drive. And if I had a daughter (there still a chance!) then I would tell her a bunch of CYA stuff also, probably much of the same things but also different things.

You can always offer to call them a cab or contact the police for them, or give them some money for the bus if its an option. If it is out in the middle of nowhere, the local police will probably help out since this kind of thing probably happens a lot.

Absent any useful context about the situation at all, it’s very strange for a girl to ask a random guy for a ride home. Most women I know would 100% ask a girl. I think it’s very reasonable to think something is up here.