Whut? She read the book for ages? Man, how lucky is she? It's not odd to spend days on a single chapter in advanced topics. From experience, once past the early, easy pages, complex topics start to jump around. You really have to be completely aware of past publications, references, and related case studies to be able to understand an advanced textbook like a story book. But, who knows, maybe she lucked out and the first book she picked was the "Advanced Herbology For Potion Concoction for Dummies".