One possible theme could be the sense of independence. West Coast is often associated with a more laid - back yet independent lifestyle, so the woman in the story might embody that.
The theme might be centered around love and longing. The West Coast has its own charm and allure. The woman in the story could be in love with someone or something related to the West Coast. It could be a love for a particular place, a person she met there, or a lifestyle. Or it could be about her longing to escape from the West Coast, maybe feeling trapped by the expectations or the culture there, and her journey to break free.