You do realise that Superman is a Kryptonian right? AKA not Human. Considering his feats, if she was to become superior to him with her human physiology, chances are she'd end up like All Might described to Deku before training him. Her limbs would fly off and her body would explode from trying to replicate the level of power he has in the body of a regular human. Creating superior mental abilities are a different ballgame from creating "Superior" physical abilities like Superstrength at the level Superman has. And wouldshe be replicating 1/all of his powers or just becoming a being superior to a Kryptonian?