After completing the guest, you get a message to go to the library at the Knights of Favonius headquarters

you headed there opening the silent library door you saw the woman; in the purple hat sleeping at her table

"Ah, you're really bothering me!" she groaned a little when you blew in her ear, disturbing her sleep

you chuckled and stood in front of her desk when you asked about potions — as a wizard who had extensive knowledge she nodded.