From "Smallville: Prophecy (#10.20)"
] There are two paths laid before you, Kara. You can leave Earth now and allow Kal-El to embrace his destiny, or you can stay and help him, risking the future of this planet.
Kal-El and I have fought Darkseid before.
] You involved Kal-El against my wishes. He was too weak then, and he was almost overcome by darkness. You have grown strong. Your will is no longer at the mercy of my command. You will need that strength to forge your own path. It is in your hands to choose.
You want me to just walk away?