Of course Lara being Lara, she would create her own cells. Maybe have someone nonhuman on the payroll to have communications that Ivy can't see ...
That's an interesting thought... someone completely nonhuman to Ivy-proof records, because she sees whatever a HUMAN commits in writing. The question then becomes,
how nonhuman does one have to be...? Mab suggested that Thomas was human enough to be the WK; was she
lying deceiving? If he
is "human enough" to be WK, can Ivy see his writings? What about the Fae? Jim has said there is a touch of the mortal in every single faerie. But this is all WAG off of a WAG, speculating based on a speculation...
Jim revealed a LOT of stuff in his intro to that short.
But in the story itself? Lara got orders from... somewhere... and passed them on to Thomas (via Justine).
I don't think it specified where Lara got her orders. It may have been directly from Ivy, or there may have been one or more cut-outs in between.
But I don't think the actual in-character writings have ever so much as
hinted that any of the Venatori knew their ultimate commander was the Archive; I think none of them realize the Archive is privy to all writing, including digital storage.
And in these days of digital phones... even verbal communications may be captured by the Archive; all except for in-person / un-recorded ones.