i think might have been Catwoman or Roulette who suggests Terra , it was after the yacht & prison scenes
The cloning happens after you go to the cloning room , Lex will say he needs tech for it , you do the heists for it at least 3 i think maybe 4 , then after you complete each heist go to clone room and lex fixs the clone machine , then you get the option to create Powergirl , the princess the vandal savage shows you and you kidnap her , & lastly Terra , so far only 3 clones , hopefully more later , like clone of villains like catwoman who dont have a sexual romance with would be good or female versions of the Justice league , like a batman female , superman female , flash female , aquaman female would be funny