Question: why ciri asks who is yennefer?
Answer: She had a vision of Geralt shouting for Yennefer. That's why she went to the woods after waking up. I think it's because of the djinn and the last wish that Geralt made which the audience was not privy to. ... But I thought Ciri asked that because she saw in her dreams that Geralt is calling Yennefer.