Overall it looks like a pretty nice swing to me. Coogansbluff mentioned the orientation to the side toss. I think that may also cause some of what you see in the gif. One thing that sticks out to me is the orientation of her shoulders in relationship to where a pitcher would be. If there was a pitcher throwing to her, she would have trouble seeing the ball, IMO. But I believe this is due to the side toss. I would guess her upper body orientation is slightly different with front toss. Personally I think there is a lot to like here.