Without exaggerating, I bet there are a million stories just like this. Every Catholic School had a Sister DeSalle. Mine was our sixth grade teacher, Sister Hildegarde - all 6’ of her. I swear that nuns used to take a course in knuckle whacking.
We had Sister Elrita; even the parents were afraid of her. But, in defense of nuns in general, for every Sister Elrita we had a dozen wonderful ones like Sister Bede and Sister Isabelle.