Bree was born in Nevada on March 11, 1990, but lived in Idaho for most of her life. Bree believed that her mother had left her abusive father when Bree was four; in truth, Bree’s father murdered her mother. He buried the body in the desert, then packed up and moved to Idaho with his young daughter. Becuase of the abuse, Bree felt isolated from her peers. She was a quiet, withdrawn girl. No one ever noticed the signs of her abusive home life, despite some physical evidence. Finally, Bree ran away from home a few weeks before her sixteenth birthday. She had enough money for a bus ride to Seattle, but nothing more than that. She tried unsuccessfully to get a job, and began stealing in order to eat. She slept in parks and alleys – any place where she felt a little bit safe. Her biggest fear was that the police would catch her and send her home to her father. She’d been on the run for less than three weeks when Riley found her behind a restaraunt, picking through the trash bins.
Unbeknownst to her, her mother’s bones were found by the police, and when they did not find Bree, they were led to believe that she had met the same fate and arrested her father for both murders.
One night, after three months of becoming immortal, Bree went hunting with Kevin, a blond vampire who called himself “Spider-Man” (whose real name was Casey), and a disciplined vampire named Diego. When Kevin and “Spider-Man” started squabbling over a human, Bree and Diego went hunting on their own and used the time to get to know each other. When the sun arose, Diego and Bree hid in an underwater cave. They later discovered that vampires weren’t vulnerable to sunlight, but rather sparkle like diamonds. When their army left Seattle without leaving a clue, Bree and Diego set off to find them on their own until they finally caught their scent and followed it to their new location.
While Riley went to visit Victoria, Bree and Diego followed him to tell him of their discovery, only to find out more than they’ve expected to about the world of vampires when the Volturi approached Riley and Victoria. Diego proceeded with his plan while Bree went back to their group and awaited their return. However, Riley later told Bree that Diego had gone with Victoria to watch the Cullens after he informed the army of the plan to destroy the “yellow-eyes”. He seemed hard and cold to Bree. That was why Bree was suspicious of their real agenda, but she decided to stick with them. When the army prepared for war, her new friend, Fred, decided to leave and explore the world, and asked Bree to join him. Although she wanted to, she decided to stay until she found Diego.
When the Cullens and werewolves destroyed her army, she found no trace of Diego and realized that Victoria and Riley had already killed him for confronting Riley about the “burning sun”. Carlisle and Esme Cullen offered her safety in exchange for her surrender, which she accepted. When Jasper Hale saw her, he instinctively crouched to kill her, but Carlisle stopped him and explained that Bree had surrendered. Jasper disapproved, but was convinced by Esme to leave her alone. He agreed not kill Bree if they let him watch her, since he knew how newborns act