Since we don't have much context, she could be anyone. She might be an ordinary girl with a passion for the sea, or a character created to represent the relationship between humans and the ocean.
The main theme might be about the relationship between the woman and the sea. Maybe it shows how she depends on the sea for her livelihood or how the sea shapes her life in some way.
The 'young woman and the sea story' could be a story of a young woman's struggle against the sea. For example, she might be on a ship that gets caught in a terrible storm. She has to use her wits and courage to survive. It could also involve her emotional journey as she battles her fears and insecurities while being at the mercy of the vast and powerful sea.
Well, a woman is the main element, of course. And the sea, which provides the setting. There might also be elements like a boat if she was sailing, or a coastal village if her story is related to that. Maybe there are other characters like fishermen or her family members.