Tracy Bell is a hunter.
She was first seen killing a vampire in a truck and getting kidnapped by Abaddon's demons. She and Irv were rescued by Sam and Dean Winchester. She revealed that her family was killed by a demon who was celebrating the release of Lucifer and hated Sam for being the one who caused it. Sam and Dean split up and she went with Dean who convinced her of Sam's good nature despite his mistakes. They encountered Abaddon and Tracy shoots Abaddon full of Devil's trap bullets, but they were rendered useless as Abaddon was wearing a bullet proof vest. Dean splashed holy water on the demon and told Tracy to go get his car. She then drove the car and fetched the Winchesters to escape after Abaddon had disappeared. Before getting into the car at the end, she asked Sam if he was alright and when he responded affirmatively, she replied good, signifying to him that she has forgiven him.
Later in the Bunker, Sam reveals that he is apologetic and guilty for what happened to her family.