This quest may not appear for you if you don't have the right main questline. This quest is part of the main story but exclusive to one of the main crossroad choices in Serendia. You'll need to play through that version of the main quest on a new character to get the knowledge.
All of the crossroad quest chains have exclusive knowledge btw.
What classes have this quest cause she don't have the quests and neither does Enrico Mancini??? I am a Valk just tryin' to finish a knowledge list, that's all. Nothing more.