Darkseid treats her like nothing at less than full power.
You ignore the entire context though. Wonder Woman had been fighting Jason and Grail at the same time first. Darkseid then completely blindsides Wonder Woman with Omega beams, which leaves Diana clearly hurt with smoke coming out of her back and it takes her a full page to recover. So it's not like he's facing a 100% Wonder Woman or anything close to it. Darkseid says that the Justice League matched him last time so that implies this writer's measure of Darkseid is the combined might of Superman, Batman, Wonder Woman, GL, Flash, and Cyborg.
How to make an entrance: https://www.youtube.com/watch?v=49xWJJvpjzI