Who is Dr. Paige Marshall from Choke and what is their importance?

Paige Marshall is a patient in the hospital, who wears a doctor's uniform and impersonates a real doctor. When Victor finally finds out she's been lying to him about her identity, she apologizes and admits to the lie..... then she tells him that she has actually traveled back in time, looking for someone to impregnate her so she can travel back to the future and destroy the plague permeating her world.