A. The parents did not administer the punishment
B. The Nun obviously has delusions of divine power
C. The instrument used is a solid piece of wood more akin to a club or cricket bat than a rod (as in Spare the Rod and Spoil the Child)
D. I heard that is was common to administer as many as 39 strokes

Non of the above can be remotely interpreted as suitable Corporal Punishment; even by former Military standards of justice circa 1800's, on a child under teenage years. Therefore she will be found guilty, but spared by her obvious delusional mental state, and advanced years. If she (or anyone) touched any kid of mine like that, I would break the fucking bat on her head.