A bit of extra Imogene lore nobody asked about, but you still get it for free! Yay! Because her tragic love for Yrliet is something I rarely talk about because it feels so deeply personal for some reason.
So, we as the players know what happened, how Marazhai played Yrliet and got played in return by his Cabal besties. How Achilleas *was* the one who ultimately went behind everyone's back because he was tortured, because he was afraid and depending on if we have Yrliet in our retinue or not, he can be the one to lead us into Marazhai's hands. If we do have Yrliet with us, however, she kills Achillleas (a mercy kill, really) and is the one that springs the trap in hopes of finding her kin (following breadcrumbs is even the quest name and it is what she's been doing for so long now).
Okay, so what do *they* know? Absolutely jack shit, especially considering Marazhai is out of the picture here and cannot proudly claim how he mentally obliterated Achilleas.
So what does this have to do with Imogene? Well, she's kinda stuck between a rock and a hard place. Between a hammer and an anvil. Between a pissed off Interrogator and an Aeldari and that is a very scary place to be. However you wish to call it, she is between two people she cares about, and one is always seconds away from starting a bloodbath.
Imogene absolutely believes Yrliet's side of things, she doesn't need proof. Then again, the earlier talks with Yrliet in Commorragh has left them in a kind of a relationship limbo? Both claimed they don't know if they can trust each other, but still do? They want to.
Then again, Imogene felt betrayed, deep in her bones she knew that everything she went though in Commorragh is Yrliet's doing, knowingly or not. And it doesn't help how Heinrix, obviously not wanting to believe Yrliet especially now, speaks to that rational, cold, dogmatic part of Imogene.
Like, it was never said outright (one can argue it was in the conversation I attached to this little essay), but every conversation we have with Heinrix about Yrliet from this point onwards is just him going "are you stupid?".
And Imogene feels like an utter fool, because there should absolutely be no doubt about it in her dogmatic heart.
But just as Yrliet noticed something different in Imogene, so did Imogene start to believe that things can be different. And, in the end, just like Yrliet chose her own people so did Imogene choose hers, letting that Imperial dogma (*cough* Heinrix *cough*) poison her against Yrliet, gradually, until things reached a boiling point over on Quetza Temer, but that is a story for another time (just like how Commorragh absolutely shone a light on the absolutely hateful side of Heinrix).