One possible theme could be friendship, as the little penguin might make friends with other animals in its habitat.
One possible theme could be survival. Penguins live in a tough environment, so the story might show how the little penguin copes with the cold, finding food and avoiding predators.
One possible theme could be hope. Just like a star shining in the dark, it can symbolize hope in difficult situations.
One possible theme could be love. Paris is known as the city of love. So it might be a story of a romantic encounter in Paris.
One possible theme could be friendship. Lefty Wright might rely on his friends and they on him to make Christmas special.
One possible theme could be protection. The people in the story might be protecting the little girl from various things like bullies or dangerous situations.
One possible theme could be the fear of the unknown. In many horror stories, the scariest part is not knowing what is out there. It could be that in your story, the main character is constantly in the dark about what is causing all the strange events.
One possible theme could be discovery. Margie might be discovering the beauty and uniqueness of Hawaii.
Since I don't have the details of 'my little penguin story', it could be about a little penguin's adventure. Maybe it starts with a little penguin hatching from an egg, then it explores the icy world around it, makes friends with other penguins, and overcomes some difficulties in the cold Antarctic environment.
One possible theme could be growth. Just like many novels about young characters, the girl in 'My Little Girl Novel' is likely to experience growth both physically and mentally.
It could be about a little penguin facing the cold. Maybe it's about how the penguin struggles to find food in the chilly environment or how it tries to keep warm among its colony.