I really missed the opportunity to talk (hit?) some reason into that damn girl. Geralt and Triss did literally everything for her and she's still an annoying, spoilt brat that doesn't give a shit about anybody, especially not herself and her closed ones. But all I could do as Geralt in the game was being "soft" and "appeasing" and "supportive" to her, basically licking her ass all the time, no matter what. Even Yen had not a single reproach at all for her no matter how she behaves or what she does, which is totally out of character for Yen...