Ball definitely didn't hit this line judge in the throat. She was hit on the side of the head, judging by the bounce trajectory. Also, no immediate reaction as the ball bounces off for a fraction of second without her even moving an inch. Clear case of afterthought fall, not to mention later choking sounds.
There's no visible impact spot on her head. Ball probably just grazed her.
Still, a careless and dumb move by Novak. Hope he learns from this.
Edit: For fairness, adding another angle in slow-mo:
From this angle, it might have been her neck or chin that was being hit (grazed IMO) but it's even better showcase of her late reaction. Ball bounced a meter away without her moving an inch. When she finally moves, she looks more startled than hit. Impossible in case of any substantial impact.