Carissa is playing catch-up very hard, in seeing what Athpechya would see at a glance in Hell, in seeing even as much as Keltham would see if he tried to decode it knowing nothing of Athpechya's work.
There is nonetheless a deep rhythm to the thoughts of dath ilan, a shape your thoughts take on after you've worked the math a few times, by which Asmodia saw something in a test of Aspexia Rugatonn's that others would not have seen, and Carissa Sevar has somewhat of it now.
If Carissa Sevar is looking at Hell and not trying very hard to not see anything that would break her loyalty to Asmodeus, she will see, almost immediately after trying to look there, that the devils out of Hell on Lrilatha's level are not curious, Lrilatha isn't hanging around the Project trying to find out what else Keltham knows that Asmodeus wasn't allowed to tell her. Devils' curiosity has been burned out of them as thoroughly as their care for others. They do not desire to become more than they are in a way where they know more, see more, understand more, to put everything in their eyes' reach into their mind's grasp and then send their eyes further. They desire to rise in the ranks of Hell and with that rise in authority they are granted somewhat more intelligence, but that's not why they do it.