One great way is to make up side - stories that are related to the main game story. For instance, if the game story is about a hero's journey, she could tell a short story about the hero's childhood. This can add more depth to the overall gaming experience.
She could create a treasure hunt within the context of the game story. Hide some small items around the room that are related to the game, and give clues based on the game's plot. This makes the game story more interactive and exciting for everyone involved.
The wife can design simple quizzes based on the game story. She can ask questions about the plot, characters, or the world of the game. This not only entertains but also tests the knowledge of the person playing the game.