Early Life & Trauma:
* Jenna is blind, having been blinded by a firebomb intended for Toby Cavanaugh, who was accused of starting the fire.
* She blames the Liars for the fire and her blindness, believing they caused it in a moment of jealousy.
* This fuels her desire for revenge and makes her a constant threat to the Liars.
Becoming a Villain:
* Jenna teams up with various antagonists throughout the series, including Garrett Reynolds and Mona Vanderwaal, to torment the Liars.
* She uses her blindness to manipulate situations and deceive others, making her a very dangerous and unpredictable character.
* She also engages in dangerous acts, like throwing a rock at Emily Fields, trying to get her to fail a swim meet, and even trying to run the Liars over with a car.
Redemption & Growth:
* Jenna's motives are eventually revealed. She was working with Garrett to get revenge on Toby for her blindness.
* However, she is shown to have genuine remorse for her actions.
* While she never truly becomes a friend of the Liars, she does help them on occasion, especially when they are in danger.
Final Fate:
* Jenna's true identity as the one who set the fire is revealed in the series finale.
* However, she is ultimately forgiven by the Liars, particularly by Toby, who understands her pain and tries to help her.
* Jenna leaves Rosewood and is last seen living in a rehabilitation facility, seeking to heal from her past trauma.
In conclusion, Jenna's journey is one of pain, anger, manipulation, and ultimately, some degree of redemption. While she initially seems like a pure antagonist, her actions are driven by years of trauma and a longing for justice. While she never fully reconciles with the Liars, she does manage to find some peace and acceptance in the end.