She wasn’t there when Harry and Neville followed a mangy black dog as it dragged Ron and his rat through a secret tunnel under the Whomping Willow. She only heard about it all afterwards, when visiting Harry in the hospital wing. His apparently innocent godfather had been kissed by Dementors, while the rat Animagus betrayer had escaped. Few people believed him – though Hermione did – and Harry’s version of events didn’t even make the papers.