The story is supposed to be a psychological thriller, and I was thinking more along the lines of the woman being exploited by the pirates, maybe impregnated, and then left abandoned on an island a few months later.
She tries her hardest to survive for her child, and being born on the island it's all the child ever knows and is happy and has never seen any man-made object before.
As the child is just enjoying her life, the mother is trying to think of a way to construct something to get them off the island, so that they can sail as far out at sea as they could get until they find rescue, such as coming across a cruise ship or something.
They do find rescue, and get taken to a hospital to recover, and while the mother is having help for the PTSD she now suffers, the child (probably around 8 years old) is curiously learning about how the human world works.
That's the fascinating bit.