Tell me about Hermione. Describe her in a sentence or two

Hermione Granger is Harry and Ron's best friend at Hogwarts. A first-year in Gryffindor House, Hermione is Muggle-born, meaning that neither of her parents has magical ability. Despite her background, Hermione gains a reputation of being one of the brightest witches in her year, particularly because of her unfailing work ethic and determination to succeed and perhaps because of her insecurity over her background (plus her final exam grade of 112 percent in Charms). Unfortunately, Hermione's academic diligence also gives her the reputation of being an annoying know-it-all, and she starts out the school year with few friends. Her adventure with the troll in the girl's bathroom with Harry and Ron reveals more grit than mere academic prowess, and her willingness to take the blame for the situation cements her friendship with Ron and Harry.