Lily describes her mother's death on pages 6,7, and 8. She does not directly say so, but she implies that she caused her mother's death. How did that happen?

Lily’s mother died when she was four years old. Her only memory of her mother is from the day she died; Lily recalls that she may have picked up a gun and accidentally killed her mother. In ch.1 Lily flashes back to her only memory of her mother, which was from the day she died, December 3, 1954. Lily remembers that her mother was packing frantically that day, and then T. Ray entered the house. Lily’s mother became even more rushed with his presence. When T. Ray entered the room, they began to fight, and Lily was pulled out of the room. Lily’s mother then grabbed a gun. T. Ray grabbed the gun away and dropped it on the floor. Lily picked up the gun, and as far as her memory goes, she thinks she shot her mother. I think T.Ray encourages this idea in Lily.