In other shows he's done he has shown how he primes people to think what he wants them too. He goes to extremes to do it too. Huge adgvertising posters with images and shapes on them which will subliminally suggest to her what he wants along city routes she takes frequently. Things he says innocently which are really primers to set her up. Picking a suggestable candidate from a group by testing their reactions, having her sign disclaimers which she thinks is because its a little dangerous, but it also lets him do stuff like insert subliminal images to film without telling her they are there. All the stuff you dont get to see behind the scenes. She probably thought Stonehenge was her own idea, when really it was subliminally programmed into her.