Who is Winter from The Last Command and what is their importance?

Winter or Leia Organa is Solo's personal aide and, after Leia gives birth to her twins, their nurse as well. Winter is a tall, white-haired veteran of the civil wars. She and Leia grow up together on Alderaan, and when Leia enters politics, Winter follows her. During the war, Winter moves planet-to-planet in Supply and Procurement under many code names, the most famous being "Targeter," because her photographic memory