"That doesn't mean anything. Shouldn't. I stood there and let my dad die. Chose Matt to live over him. Damon killed my dad and I still love him. We can't let that stand in the way. Damon needs to die and so does your dad."
She doesn't know if she makes sense but - it's the truth and Isaac needs to hear it.
She was weak. She let Damon kill her dad when she should have done something. Seen it coming, broken through her rose-tinted glasses. She hero-worshiped Damon, thought he could do no wrong. Even when he had always been a terrible person. Hurt so many people. He killed her mom. Tore through her dad's throat while she watched.
She can't just stand by and watch this man hurt the people she loves. Every moment he's free is a moment of pain. For Matt, for Isaac. She can't let them hurt as she hurts. She can do something about this.
"Let me help you."