Forbidden Rapture

At the night of Harry Potter's transfer to a safer location at the night of 1998, they were ambushed as lives were lost. Hermione Granger disappears without a trace; ten years later, she is found very much alive . The world condemns Severus Snape and Harry will do whatever it takes to ensure he rots in Azkaban. But why is she desperate into protecting him & begs his innocence?