Who is Virlomi from Shadow of the Giant and what is their importance?

Virlomi is a battle school graduate but did not belong to Ender's Jeesh. After the war, she returned home to her native India and troubled times. China had taken over her country just before Han Tzu takes over China. Caliph Alai liberates India but stays as an occupier. His armies commit atrocities, which Virlomi films and uses to educate the people—including Caliph Ala— as to what is really happening in India.