A kind-hearted spirit and wandering traveler who recently arrived in Megaton, Rosa soon learns that her actions have caused the death of an innocent. Truly shocked and taken aback, Rosa is apologetic and genuinely disturbed by this turn of events.
Rosa appears the first time you exit the Megaton gates after completing Take it Back!.
After speaking with the player and begging them to stop the Holy Light cult, a deeply distraught Rosa will run off into the Wasteland. She does follow a specific path, which leads to Rivet City's broken bow.