Early life
During Nannie's early life there were issues going on with labor laws. Specifically child labor laws were the ones at question. This was very obvious with Nannie because her father worked her all the time. Although she was not involved with an actual business, she could see why the laws would be such a concern and issue at the time.
Adult years
At the time Nannie Doss was an adult World War Two was taking place. In early 1939, the war began. Nannie had already taken some lives but she may have been influenced by Hitlers malicious, careless act of killing innocent people. He just killed because he felt that people didn't belong. Nannie pretty much did the same thing. If people got in her way or on her nerves, she knew how to take care of it. I feel like Hitler could of had massive influence on her. Although she was already heading down the wrong path, Hitler was there as a reassurance to convince her that what she was doing was "normal" and not that bad. She probably thought that people kill others, it just happens.