Over the years, Josephine and other Primes have been brought back several times using the Mind Drive technology that transfers the memories and personalities of the Primes into the host bodies of people with Royal Blood

After discovering that Clarke has royal blood, the Lightbourne's take advantage of her when she's paralyzed to bring Josephine back. They insert Josie's mind into Clarke, replacing her memories and personality with Josephine's. Josephine wakes up in Clarke's body, scared at first, thinking she was falling. She starts playing with her hair just like the original Josie used to.

Josie's parents ask her to keep a low profile and pretend to be Clarke in order to spy on Wonkru and figure out how many others have royal blood. She is assigned Jade as her personal guard as she mingles with Clarke's friends. Clarke's friends start to become suspicious when Josephine, pretending to be Clarke, allows Madi to go to school despite Clarke and Gaia having agreed that it was too risky. When she goes to see Clarke's mother Abby, she almost blows her cover by taking notes with her right-hand, since Clarke is left-handed

You one day run into Clarke/Josephine and she says politely Greetings