When the Vestige talks to her, there's the following dialogue:
- Hmm. This one smells some magic on you. Do you not sense it? Maybe Magrus licks your face when you sleep! Ha! What is it that you carry?
- It's a book. Can you tell me anything about it?
- Difficult to say without looking it over. This binding is frayed. A sign of age, yes? Ah, yes. You're already on your way to earning membership in the Mages Guild. We offer great rewards for books like this.
- What kind of rewards?
- We can teach you unique techniques and provide access to special spells and abilities. Enticing, yes? And from time to time projects crop up for our truly five-clawed walkers. You may end up working with Guildmaster Vanus himself.
- Yes, I would like to join the Mages Guild.
- Excellent. This one grants you the rank of Student in the Mages Guild. May Magrus bless your path. Every book you find, or collection of books completed, will now earn you status within the guild. Good luck, walker.