Possivelmente
Dependendo de seus percursos, ela pode ter visto seu passado por trás de vez em quando, antes de usar o sintonizador de tempo.
Harry, Ron and Hermione climbed the steps to the Entrance Hall... Why didn’t you lie, Hermione?... Hermione didn’t answer. Ron looked around.
‘Where is she?’
Harry turned, too. They were at the top of the steps now, watching the rest of the class pass them, heading for the Great Hall and lunch.
‘She was right behind us,’ said Ron, frowning.
‘There she is,’ said Harry.
Hermione was panting slightly, hurrying up the stairs; one hand was clutching her bag, the other seemed to be tucking some- thing down the front of her robes.
‘How did you do that?’ said Ron...
‘One minute you were right behind us, and next moment, you were back at the bottom of the stairs again.’
‘What?’ Hermione looked slightly confused. ‘Oh – I had to go back for something. Oh, no ...’ - Prison of Azkaban
Aqui, podemos ver que ela estava correndo para alcançá-la, antes de usar o sintonizador de tempo, então, a menos que ela esperasse propositalmente na esquina e cronometrasse exatamente, ela poderia ter se visto por trás facilmente enquanto estava se atualizando.