Eden Hamby is Jessica Hamby's younger sister. Other than that, not much is known or mentioned about Eden.
In Season 2, Jessica, when glamoured by Bill, begged to go home to see her little sister again. Jessica also admitted that she was horrible to her little sister and wished she could go back to make things right.
Eden was home when Jessica decided to visit her parents' home. When Jessica entered the house, she hugged Eden and their mother who thought she had been kidnapped by humans during her absence. When their father arrived home, a fight started between Jessica and Jordan, and she nearly fed on him. Bill arrived and glamored Eden into inviting him into her house. He rushed in and stopped Jessica in time to save Mr. Hamby. Bill later glamoured the whole family, including Eden, to forget the evening had ever happened. ("Keep This Party Going")