Who in the world is Bree Tanner??

shes the new born that surendered from victorias army

Bree was created por Victoria as part of her newborn vampire army to finally avenge James’ death. She never saw Victoria and her "assistant," Riley, was the one who told the newborns what to do. When the battle came she surrendered herself to Carlisle, who planned to spare her life, but she was killed por Felix on Jane’s orders for breaking the Volturi’s laws.

Stephenie Meyer wrote a novella about her...The short life of Bree Tanner.

Bree Tanner is a part of Victoria's army in Eclipse.She's also a newborn vampire.In the movie, The Twilight Saga:eclipse, she is portrayed por Jodelle Ferland.Stephenie Meyer wrote an eclipse novela about Bree.