I'm with you Ioncray, something's fishy here. Seems to me, all she would have to do was wait until they were in any moderately public place, jerk off the wig she apparently wore, and yell "I'm Elizabeth Smart". Everyone in the world has heard of her; a dozen guy would have been all over that scumbag and his old lady in a heartbeat.
I also read where she said that one of the two dirtbags was with her at all times. I'm not sure about the guy, but from the photo's of everyone involved, I'd give Elizabeth about 100:1 odds against the old lady in a footrace. Just does not sound like it was totally against her will.