Her only weakness was occasionally falling asleep while teaching us, most times mid sentence. When this happened, as we were well trained, we would keep practicing the dance moves until she woke up. Unfortunately this quite often would take up to 6 hours. To this day I still find myself shaking uncontrollably when I do the 'skipping, swish arms back and forth, nod head' move.
I found out later that the falling asleep was really a bad habit for Mother Superior; once she was allowed to wear a tracksuit, the instant sleeping ended.