My world's end

'My world's end' is a story that I am developing. It is about WW3 and North Korea is planning on starting a nuclear war with the U.S. And even plan on invading the U.S. This leads to evacuation of all of the United States but mayhem follows for a 13 year old girl after she gets seperated from her father and aunt. She has to learn to live on her own at such a young age in the aboandoned country and has to try to evacuate to Canada and find her parents before her very doom. She finds strangers along a few days who now become her bestfriends and they all work together to get to Canada.