This was not looking good for Chloe at all. She did not want to go back to Lex, she liked having her independence, not to mention that Bizarro was going to be pissed off about this. He wanted Chloe to stay at the Hyperion where she was safe. Lex wanted Chloe home. Did anyone ask what Chloe wanted? Of course not.
She could not just watch him kill this girl. And she knew he'd drag her right back to Lex anyway, and she'd have the poor girl's death on her conscience. Really, there was no choice. She'd be going back to Lex either way, at least this way she got to save a life.
"Okay, I'll go." She said quietly. This wasn't what she wanted at all, but sometimes sacrifices had to be made.