Originally Posted by J_R_B
You'd be surprised at what Murphy's Law can produce sometimes. My brother and I were palying golf in college once at about a beer per hole pace. On about the 6th or 7th hole, I was standing exactly at the level of the tee as he was teeing off, and he hit it directly 90* sideways and hit me square in the side of the face. I remember thinking right before he teed off that I should take a step back, but then I looked and saw that I wasn't actually in front of the tee so there is no way he could possibly hit me. I was really lucky he didn't hit my orbital bone or break my cheekbone, but as it was, he just left a huge welt that became a talking point at the party at his frat later that night. I didn't actually feel any pain until the next day.
That is a strange coincidence, but still in the category of low probability mishits.
In this case, someone swung the racket into the face of someone looking back at them and standing close. At least if the ball was aimed somewhere else and hit the face, I can understand - it would be like your example. Here the ball went correctly towards the opponents without hitting her, yet the racket got her.
I think it must be on the follow thru and the lady was on one side of Nuts. That is the only explanation.