To onlookers, Laura is just another Cathedral worshiper: A meek, submissive, quiet woman patiently following the lead of the rulers of the Cathedral. She is actually a Followers of the Apocalypse spy working for Nicole, focusing on finding out what is going on in Cathedral so that the Followers can expose the wrongdoings. When she meets someone who has the pass phrase, she reveals an altogether different person: Bright, sharp, sarcastic, and strong.
She has discovered the Children's plans to conquer the wasteland by systematically taking over towns, the launch point of their attacks being their hospitals, which are stockpiled with weapons and explosives. She is described by Nicole as being extremely loyal to the Followers of the Apocalypse, though it is unclear as to how long she has been working as a spy prior to the arrival of the Vault Dweller.
Destroy the Mutant leader: If she receives the password 'Red Rider' from the Vault Dweller, as provided by Nicole, she will give valuable information about the workings of the Cathedral, and unlock the door to the inner Sanctum leading to the Los Angeles Vault.
↑Fallout Official Survival Guide p.104: "Laura: Apocalypse Spy" "When you first meet Laura-sometime after you've spoken with Nicole-she will speak and act like one of the Children of the Cathedral. She is, in fact, a member of the Followers of the Apocalypse and is working for Nicole, spying against the Children. While in the guise of a believer, she is meek, submissive, and quiet; once convinced through a password that the player was sent by Nicole, she is bright, sharp, sarcastic, strong, and wary."
↑Vault13.gam: "SHADOW_PASSWORD :=0; // (61) // did Nicole give player the 'Shadow' password?"