It is terrible the woman lost her life, will be a lifelong struggle for the kids, who witnessed her being shot.
With that said, a mother of four, who has feuded long enough with a neighbor to have the police called 6 to 8 times, no matter how angry she was, should have understood banging on the neighborhood enemy's door after dark or even appearing threatening was a terrible decision. Everyone who owns property in Florida knows/understands castle doctrine and will shoot, then claim they were threatened.
People have to use common sense in this day and time, there are a number of people with guns who will kill for a variety of reasons