Like you, I first heard that BW and MS rode home from the club, picked up fast food and rode to the house so MS could get her bike.
I've since learned that they were both on bikes at Artsmosphere, and took the bikes to Taco Bell, went to BW's home to eat, and then MS left.
No car involved. (I think semantics were to blame. We rode together became understood as rode in a car.)
She is a strikingly beautiful girl, and it does seem strange that no one spotted her. Her bike route, as stated by BW and her sister, does go through residential areas, and unfortunately some really DARK areas.
Lafayette does have a large bike riding population. Maybe because we are a college town? UL doesn't have a lot of parking near the campus, so students park cars at the Cajun Dome and ride busses or bikes to campus. Also, there is a large biking club, and there are rides scheduled periodically that attract hundreds of bikes. I know Lafayette is actively trying to become more bike friendly.