Margaret a killer or acidently manslaughter?

In terms of having a view point on Margaret (Margot), acidently shouting her own husband, Francis Macomber, which lead to his death, makes sense in having that view point. No wonder the tittle of the short story was tittled, 'THE SHORT AND HAPPY LIFE OF FRANCIS MACOMBER', based on th short stories of Ernest Hemingway. In my opinion, she was so indulged with fear in loosing her only rich husband that she had, that she diced to help her husband from not being charged at by a buffalo and so she tried to help her husband out by triune to shoot at the buffalo. But, as we know, she missed the shot to the Buffalo and shoot at her husband's skull. I think this anxiety that filled her up was due to the fact that she doubted her husband to be a brave and 'the best of the best' man that he could be, changed her impression about him while he was hunting for the buffalo. Macomber was filled with a urge of braveness and manly actions, during the Buffalo hunt compared to when he was was hunting thenlion. Margaret saw the capability in what a man her husband can be, compared of what she thought about Wilson.