She could just be leaping into the air. Look at her fight against Doomsday. Also, they could easily have just slow motioned her as she reaches the ground.
I have to keep telling myself she has superpowers and this is all fiction cause some of physics and moves, and the use of slow motion in these fights look odd. Also, I'm still not convinced on gal but I'm still hyped. I never really pay attention to the acting on cbms, but the action.