Who does Gianinne become while playing the game "Heir Apparent"?

Gaininne becomes Janine, a girl who discovers that she is heir to the throne by decree of her father King Cynric. She has spent her entire life living with sheep herders in the small town of St. Jehan, in hiding when her safety could no longer be guaranteed in the castle. She is never out of his mind however, and when he falls ill, not trusting anyone around him, he asks that she be named his heir.