>>50160325I don't see how people aren't understanding that. The sun sets on the ship as it sails away and disappears. The sun has set on her first love and she's saying goodbye to it, it's a nice way to show she has become mature and will continue to do so as she lives her life with the story moving on without her.
Obviously it's not a 2deep5me show because it's for kids but they had limited time to convey what they could, Serena was lucky to show back up at all. I don't think she will ever come back after this to be honest.