By: Am I Ginger

In reply to 4ever Chyler.

I don’t think we see Lillian told Kara’s secret on screen. I think it’s inferred/implied back in season 02, probably episode 7, “The Darkest Place”. I’d have to re-watch to be sure. But that’s the episode where it’s revealed that Jeremiah Danvers is working for Cadmus, so that is probably how Lillian knows.