Sarah was a Mystic Falls High School student. She was a good friend of Aimee Bradley and Tyler Lockwood. She had a crush on Jeremy Gilbert, and she encouraged him to party at Lockwood house with Aimee, Tyler, and herself. She was later compelled by Katherine to bait Tyler in to killing her, in order to get him to trigger his werewolf gene.
Sarah displayed an interest in Jeremy, though Aimee advised her against it, stating that Jeremy was "damaged goods," likely due to his reputation as a reformed drug-using bad boy. Tyler invited Aimee, Sarah and Jeremy over to his house one day when they didn't have school. Later at their get-together, while Jeremy and Tyler were talking, Sarah saw them holding the moonstone and playfully took it. She and Aimee teased the boys by passing the moonstone back and forth and hiding it from them, and though Tyler insisted that she give it back, she told him he'd have to take it from her.
Sarah later attended the Masquerade Ball at the Lockwood Mansion, and went into Tyler's late father's office with Aimee, Tyler and Matt to sneak vodka and dance in private. Matt, who was compelled by Katherine to bait Tyler into killing him and triggering his werewolf curse, started to get drunk and saying rude things to Tyler about Tyler's dad. The two boys started to fight violently, but Caroline heard the fight from out in the hallway and intervened at the last second. When she realized that Matt was compelled, she knocked him out to keep him from going through with his friend. Unfortunately, unbeknownst to Caroline, Sarah, too, had been compelled by Katherine as a back-up plan, in case Matt was unable to finish his task. She muttered, "If Matt fails, I can't" before grabbing a letter-opener and stabbing Tyler in the shoulder with it. Tyler, who was already enraged from his fight with Matt, threw her off him, causing Sarah to fall and hit her head on the desk on her way to the floor, which snapped her neck. Tyler began to panic again, and tried to shake her awake, but Caroline checked her pulse and realized she was dead. Tyler began to freak out for a moment before falling to his knees in pain. When he opened his eyes, they were black and gold, like a werewolves, indicating that Sarah's death had triggered his werewolf gene, making him a true werewolf.
After Sarah died, students at school put a bunch of candles, pictures, flowers and notes front of her locker in memory of her life.
- Season Two
- Sarah in the TV series takes the place of Sue Carson in the book series as the character to activate the curse of a werewolf.
- Both Maiara Walsh (Sarah) and Claire Holt (Rebekah) are in Mean Girls 2.