As luck would have it, guess who I just ran into?
She left the key in it. (Over night.)
And in the middle of the night, someone was prowling the apartment parking lot, looking to see what they could take from unlocked cars. Bingo! A whole car.
Funny thing about the manual trans: one of her neighbours heard a racket "like someone drag racing" on the road and looked out to see the Mirage making all kinds of noise but not proceeding very quickly down the road. Apparently it took the guy 5 or 10 minutes to manage to drive it out of sight of the building! Clearly didn't know how to drive stick, but knew enough to eventually get away. The neighbour thought (from all the noise and the way it wasn't progressing) that there was something wrong with the car.