Can Cass predict what your character is thinking/planning/doing? Sure!
If yes, what limitations do you have on this? I am not sure how the ability quite works, so I'll just put here that Chromie's actual body is a lizard the size of a bus, so she might not have as many habitual or instinctive tells as someone born into a humanoid body. She does spend a lot of time in humanoid guise, though. So I'm going with yes, that's fine.
Is there anything you'd rather she not be able to predict? Chromie's human disguise is magical, so if Cass can't see through that sort of disguise then she won't know Chromie's a lizard I suppose.
Anything else? I don't think so!