Lindsey is a character in Colony; she is employed by The Transitional Authority to teach Gracie Bowman and Hudson Kenner in the Bowman home when Will Bowman started working for Homeland Security. She also teaches the children in the Burgess home.
Lindsey hasn't given any appearance of being there to spy on the Bowman family but noticed and commented on Katie's behaviour when she was upset because of a Resistance operation. Her true loyalties become apparent in Season 2.
Lindsey wears a lapel pin, that looks to be the same as the symbol for The Host Religion, and Lindsey attends church services for that religion.
She is shown to be slowly and steadily indoctrinating Gracie.
Lindsey is killed when members of the Red Hand group break into the Bowman home and shoot her.