"I'm not letting you leave. I can't have you out there when you're not yourself." She finally came to stand fully, letting her arm go which simply flopped lazily to the side; unmoving. Her muscles were tightening on their own accord, making her agonize a bit more as pain radiated through it.
"I'm going to fix you and I need to keep you here to do that." Tough love. Elle didn't want to fight Adam, but he was leaving her no choice if he was going to just get up and walk away. Her stabilized mind had been shattered the moment Adam said he could never love her. She wasn't thinking this all the way through.