Following the death of Empress Christabel IV, Nelson was discovered have been supplying the Kingdom of Tzac with arms and information, leading up to its attack on the allied forces. After hijacking a Rook, she was pursued to the Trilliack system, where her fighter was disabled, and she herself arrested for conspiracy to commit treason.

1. Isabel Nelson only appears in TBFTSS: The Pandoran War and not the novel trilogy.