Spoiler warning: Plot and/or ending details follow.
Balayna was a descendant of Humans who had been part of the original group to settle Tarsus IV.
By 2246, she was in a relationship with Starfleet Lieutenant Commander Gabriel Lorca. Balayna was one of the few people Lorca allowed to refer to him as "Gabe". After a fungal infection attacked the food supplies on Tarsus IV, Balayna was summoned to an amphitheatre by people working for new Governor Adrian Kodos. She became one of the 4,000 who died when forces under the command of Kodos murdered the colonists.