Hit Or Miss
After seeing this frame, we can only ask whether she hit the incoming tennis ball or did she miss it altogether. No matter how good a tennis player you are, you can’t do much good if you’ve lost your line of sight. It’s possible the hair swing only happened in a split-second, so she might have seen enough to anticipate the ball’s direction correctly.
This explains why many female tennis players, or players of any sport in general, like to keep their locks in a bun. That way, the strands are kept at bay, and they can focus on their game without any distractions.