Lauren welcomed Tris Prior, who was with Four, to Dauntless upon landing on the net below the faction headquarters. She was assigned to the Dauntless-born initiates while Four taught the transfers.
When training Tris' initiation class in stage 2, Lauren used her fear landscape. She explained how two years ago she was afraid of spiders, suffocation, walls that inch slowly inward and trap you between them, getting thrown out of Dauntless, uncontrollable bleeding, her father's death, public humiliation and being kidnapped by men without faces. During this part of training, Tris developed a fear of kidnapping after experiencing it in Lauren's fear landscape.
Lauren was described by Tris as having dark hair and a pierced eyebrow when she first met her in Dauntless headquarters the day of the Choosing Ceremony. Later in Insurgent, it is mentioned that she also has a lip piercing as well and that her ear is pierced from top to bottom.