Sayuri observed Sarah closely.
This girl was more troublesome than she thought.
Due to her mission on gathering information on Kyle, she had also collected and observed those around him - and this included Sarah.
That was why she knew Sarah's schedule. She always had her dinner at a particular cafe once a week, as it had 'special memories of Kyle' - though he had never brought her there. It was a place Kyle would go to sometimes with the Elite Five.
Sayuri had chosen to go all out on her disguise this time, for Sarah must not know that it was actually her. Thus, she had chosen what she felt Sarah would subconsciously create as the 'perfect' girlfriend for Kyle.
That had been Sayuri's analysis of Sarah's behaviour. Her almost obsessive behaviour - with the flower tribute in the canteen - not to mention the controlled methods and actions she had in guiding the fans of Kyle.
Sayuri wouldn't be surprised if there was a Kyle shrine somewhere.
