Cale's only problem, though it is a massive one, is that she is Rucka's pet-character and no one else seems to be the slightest bit interested in writing her.
And tbh I can see why, because Cale is stuck in the world where she has to compete for villainy-space with actual gods, mythological monsters and cheesy pulp-villains... she just ends up looking like the most boring character of the lot. Especially so because Cale does Luthor better than Luthor, and never actually looses her mind to the degree where she dons a suit of armor and actually tries to take Diana on in a fight.
Now I can see Cale's potential, because she really could be Diana's Luthor, but the problem with her trying to be that is that she's up against far older, more established and more colourful villains. While Luthor started off a bit zany and evolved into his current form over the decades, Cale just arrived like that.
But how do you give her the prominence her potential has? Writers just need to continue to use her, but if only Rucka wants to... I dont think she will escape limbo.