The Unsinkable Terry Jo

It was November 1961. The waters in the Bahamas were as blue and beautiful as ever. But for Nicolaos Spachidakis, a second officer on a Greek freighter called Captain Theo, something seemed off. As he looked into the distance, he could make out a tiny white speck, bobbing alongside the waves. It was too large to be trash, but much too small to be a boat. 
As they pulled alongside the speck, everyone gasped. Because that speck was a float - barely what you could consider a raft. And sitting on top of it was a blonde-haired, eleven-year-old girl. She looked skeletal and her skin was severely burned from the sun. Her name was Terry Jo Duperrault, and she had been drifting in the Atlantic for 84 hours before this crew had found her...

Sources: 

1) https://allthatsinteresting.com/terry-jo-duperrault
2) https://www.cbsnews.com/news/book-em-alone-orphaned-on-the-ocean/
3) https://en.wikipedia.org/wiki/Bluebelle_(ship)
4) https://time.com/archive/6871882/the-sea-the-bluebelles-last-voyage/
5) https://www.rd.com/article/orphaned-on-the-ocean-the-unbelievable-story-of-terry-jo-duperrault/