Like the three Kryptonians Superman faced in Superman II and the Man of Steel, these superpowered cows did not use their abilities for the greater good. Eventually we caught them and two saw the error of their ways and pledged to only use their powers for good. Zod, however, did not calm down, nor did she make any agreements.
So we exiled her to the phantom zone.
Ok, so technically we didn't send her into a flying square rotating in space, We did send her to be sold at the stockyard. It was disappointing to see a nice animal leave, but if she could not abide by the rules then she could not stay. Even if she had super powers!