What would be better;
>Livewire finding out Supes secret identity without his knowledge, and using it to ingrain herself into his life before going for the kill
Would be interesting with Leslie starting off thinking Clark's pathetic for "pretending" to be a two-bit reporter, but have his positive outlook and optimism slowly and surely rub off on her.
>Leslie only knows Superman under alias, and Clark is proactive in trying to patch up their relationship when he learns she thought it was his fault for the accident that caused her powers
Would put the onus on Clark to try to make peace with a supervillain, which gives space before possibility of romance