After the derelict spacecraft was discovered, the Xenomorph eggs located inside the spacecraft were taken back to Hadley's Hope for study. However, the Xenomorphs escaped and overran the colony, capturing many colonists, including this one, and cocooning and impregnating them in the hive at the atmosphere processor.
The Colonial Marines who were sent to investigate Hadley's Hope soon found the colonist in the hive, who was the only living person left in the hive. The colonist begged the marines to kill her as she painfully birthed a Chestburster. Apone then incinerated both the Chestburster, and the now-dead colonist's corpse.