After the Anesidora discovers the flight recorder for the USCSS Nostromo, she and the rest of the crew voyage to where the Nostromo was heading when they disappeared. It is on an alien ship where they discover the beacon as well as a large nest of large eggs. At some point later, a parasite attached itself to her. It was found dead not long after, she assured the crew she was fine. Marlow insisted on putting her into hypersleep, at least until he could get her checked out at the nearest station.
After making her way onto Sevastopol, Dr. Lingard discovered some sort of parasite within her. She died not long after it burst out of her chest. Due to quarantine protocols being ignored by Marshal Waits, and the unknown creature now running freely on board. All medical reports about her were deemed classified.