Lena's feelings for Kara were confusing, to say the least. But after the "Big Reveal", at best, she could say that Kara made her feel insane. Or perhaps she'd always been a bit mad. It only just got worse after Kara's betrayal. But even so, Lena felt unable to turn back. Madness was all she had left. And she would fan the flames for all it was worth. It was just the Luthor in her.