From Halopedia, the Halo wiki
In September 2552 the Covenant vessel Valorous Salvation retreated from the battle at Reach and landed on Beta Gabriel, where its Jiralhanae crew began to sadistically massacre the planet's human population. Nixaliz was rounded up with the other humans and brought to a camp where her fellow humans were torn apart and eaten. Unable to eat a healthy amount of food, she became very gaunt and weak. Connor Brien suspected that prior to the internment she had been pretty.
She took part in Brien's plan to escape, shouting like mad with Vern in order to increase confusion when Jiralhanae began to fight amongst themselves. However, rather than attempt to escape she sought vengence, and shot Chieftain Parabum in the face repeatedly with a Spiker before another Jiralhanae swatted her head clean off her shoulders.
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