Well, I've read all 46 pages and haven't seen anything about Yennefer and strange letters you can find in game. First one is from Vigo! And she is calling her a friend!!! I was really puzzled, and became worring that Yennefer didn't get her memory back or she was fooled by Nilfgard sorceres. And her strange behavior in the game was confirming my fears. Then I've found letter about djin... and again I was worried... it seems she didn't know why she was looking for him. She said like her obsession of djin is strange and she don't know why she kontinue to look for it. There is also a letter about Emgyr plans for lodge... and I think she is asking how she will handle consequences. There is nothing specific but I think Emgyr plan wasn't to free sorceress instead he was going to imprison them or worse and Yennefer didn't tell them truth. But I never learned what happend to them because I didn't killed Radovid. And there isn't any info about rest lodge after I finished game. So I have an impression that Yennefer has agreement with Emgyr but it's a bit different from what she is saying to lodge. What do you think about this? Also didn't you find strange that Fringila Vigo call Yennefer friend in that letter?
As for ingame image of Yennefer I see a quite a bit of bad decision from Reds. First of all it's Last Wish quest and whole djin thing. It's so wrong in many ways
also I find it's strange that she force Geralt to help lodge. After what they have done to Ciri and her I don't think she will ever help any of them apart from Triss. This is also a big mistake from Reds. Well, only if her true agreement with Emgyr inclune enslavement of all lodge then I can understand her motives. She just use lodge to rescue Ciri and then betrays them as they refuse to help her when she was asking (I mean from books).