Yeah, I didn't need her to fight Wonder Woman in the story but a reference in the bio would have been sufficient.
In fairness, I don't recall Giganta being portrayed as a villain specific to Wonder woman in Super-Friends which that story is an obvious "grown up" version of. So it's taking cues from that.
Oh, man. We need to have Rucka come back for at least one issue to nuke that plot point like he did all of New 52.