She recalls quietly asking to borrow a fellow student's eraser after the nun said no talking. As a result she was sent to the "Keeper," the girls' supervisor.
Kretschmer said she received a strap along both hands and forearms.
"I tried to be tough," she said. "I thought I could take it."
The beating stopped after the strap got caught on the Keeper's rosary and it broke.
"The kids were crying because they saw me getting a strapping," said Kretschmer. "I dealt with it. I cried. But that wasn't enough punishment."
She said she was forced to sit in the middle of the floor during recess for at least two days while other kids played.
"I felt so hurt, so humiliated."
Read the rest of Ms Krestchmer's story and view her interview below.