CW may very well forget about Jeremy from time to time. Certain classes of people are often invisible to their "superiors" (as they think of themselves.) These include servants, waiters/waitresses, secretaries, janitors, etc. And having worked my way through college as a waiter for a catering firm that handled functions for the elite of the North Carolina state government, I know what kind of very surprising things people will let slip when there is "nobody" (meaning only the invisible people) around to hear it.
It wouldn't surprise me a bit of Jeremy was "invisible" to Corpse Witch. And that he knows much, much more than she realizes. Jeremy is really the one Officer Basilisk should be trying to suborn, but apparently he's invisible to her also.