I have some more ideas here, so here goes.
One. After my car breaks down on a quiet road, Im picked up by a man or woman, who gives me a laced drink, and while Im unconscious, dresses me up as their fantasy goth, alice in wonderland, or ultrafeminine companion. They could be constantly on the move, or be moving to a town, and have me put in as their 18yo daughter. No one in town would believe me when i told them otherwise.
Two, stopping at a diner in a town, Im given a laced drink, and find myself as the diner's newest captive waitress.
Three. Lost while travelling through a remote area, I stop at a farmhouse, and after accepting a laced drink, pass out and wake up to find that Im to be someones rural companion, or new bride even.
if any of these appeal to you, or you want to know more about either one, do ask.