She and her Mother had to eat tulip bulbs to survive.
I had a co-worker who was about her same age who also lived through the Nazi occupation. His stories were tragic. As an adult his teeth would bust from internal rot and he had them all removed. Entire occupation he had one egg and he could describe it as heaven.
It's the reason Hepburn was always so thin and frail. She was denied the substance any young and growing child would near to grow healthy. F'ing Krauts, they started the whole mess and Montgomery, that Limey twit, he sure as heck didn't do the Dutch people any favors.