Location: Triss’ Townhouse (Novigrad)
Triss is concerned about Ciri and would love to help you, but she cannot leave Novigrad until all the mages are evacuated. You must have already completed the following:
Secondary Quest: Now or Never, and the mages escape. If you forgot this quest, you can’t reach Triss. If you completed this quest, Triss is already at Kaer Morhen, and doesn’t need to be found.