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this is when Delila first turned into an infected. Here's how she became infected:

Delila lived in a broken family enviroment, a drunk for a father and her mother long gone. She was the only child and she usually was treated very badly. One night her father came drunk again and after awhile, he heard a knock on the door, we ordered Delila to open it and a zombie then lashed at her and bit her forearm. She managed to push the zombie out but with a price. When her father yelled at her, startling her, and she eventually ripped him apart(hence the blood all over her). So yeah... that's my take on how she became a infected.