Public libraries could be entered and utilized when she was feeling brave. If there was one trait Hermione Granger was known throughout the land for, it was her love of books. She was well aware that libraries often were searched when she was the prey. It made sense to look for her in the quiet buildings. Where else could a person sit in a chair undisturbed for hours? She only entered them if she was truly desperate and at a loss what to do next.