Mhm. Yes, I have difficulties imagining Yen storming blindly off to chase the Wild Hunt who had kidnapped Geralt. I think she would have gone to a good library, have done research, thought it over, selected some options, and then tried to locate them with magic, contrary to Geralt's impulsive methods of blindly running around in the wilderness.Again, in the game, there is an opportunity for Yen and Geralt to chat about it. She mentions that she never did thank him for that and he said that she would have done the same for him to which she said no, she wouldn't have. And frankly, she didn't because when she did recover her memory, she did nothing to contact him.
Anyway, you seem to miss a little detail, when accusing Yen of not seeking Geralt after her memory was returned by the mages who served the people who held her imprisoned at the time. That little detail would be the surprising fact that she was inconveniently imprisoned at the time and thus sort of not in a position to locate Geralt.
When Emhyr set her on Ciri's trail and got the "regicides are fun!"-assassination plot going, we were already well into the events of TW1 - meaning that the henna-haired one already had done her move and was broadcasting in the sorceress megascope-twitter world about it (compare her chat with "Keira-Philippa" in TW1), and so Yen had all the reasons in the world to be upset that Geralt had apparently run off with that cow, while she herself was in jail.