It would do Wondy good to have a foe like that - she needs a few plotters and schemers amongst all the monsters and pummelers.
This is so backwards. Minerva is actually the only member of Diana's rogues' gallery who's remotely a physical threat. Giganta is a joke - she's not even in Cassie's league. The only reason Silver Swan ever puts up an effective fight is that she's inevitably a victim and Diana never wants to hurt whoever's in the costume; the true battle there is always psychological, always a matter of finding the guy pulling the strings. Ares is way out of her league physically; they've never meleed, he'd flatten her. Dr. Poison? Mundane human who creates toxins. Dr. Psycho? If she ever actually punched him, his head would cave in. Circe? She's a sadistic version of Mxy, as is the Queen of Fables. Devastation? A manipulator who created cults and brainwashed Cassie to set her against Diana. Angle Man? Again, mundane human, one who has a distaste for violence and is basically about the chase scene rather than the fight scene. Of Gail's new rogues, Achilles went down in two pages and Wacky Alkyone constitutes zero real physical threat, leaving only Genocide. Veronica Cale pretty clearly doesn't bring any brawn to the table. Chang Tzu, Cyborgirl, and Clea are all mastermind types with no physical capability. The White Magician was the man behind the curtain of a gang war.
Diana's got two meaningful bruiser rogues, which is something like ten percent of the pile, and one of them is a Hot New Foe who twenty bucks says will get forgotten the moment Gail's off the title, and the other jobs to Catwoman. The absolute last thing she needs is yet another villain who threatens Diana on a non-physical level. She is way, way, way overloaded on plotters and schemers. Of which, it should be noted, a properly-written Barbara Minerva is also one - she is, like Diana, as smart as she is strong, and like Diana, both willing and able to use every one of her many, many resources to achieve her goals, including her wealth, her reputation and good name, her charisma, and her tactical cunning.
... sorry. The state of Diana's rogues gallery is something of a sore spot.