What did Margaret do?

     In The Short Happy Life of Francis Macomber, Hemingway includes a very unexpected ending. From the title, we know that he had a short life, so one may be able to predict that he dies somewhere in the story. However, it would be quite difficult to predict the actual ending. At the end of this short story, Francis becomes really excited and confident in himself, so Wilson decides they should go back and finish off the bull. Once they are face to face with the bull, they are struggling to kill it. They shoot it many times, but each time they somehow miss their mark. Seeing the men having trouble, Margaret takes the gun from beside her and shoots it; however, instead of the intended target, she hits Francis. Now, in the literal sense, this is the complete answer. She shot her husband. But why? The story makes this incident seem like it was unintentional. To me, it seems that Margaret intentionally meant to shoot him because she wanted to leave the marriage. In the story, Hemingway says that Margaret would never leave Francis because he had a lot of money and he would only make more. It also argues that Francis would never leave Margaret because he was not very good with women, and he was afraid that he would not be able to find another if he left her. So basically at this point in their marriage, they were stuck in a dead end relationship. I think that on some level, Margaret could no longer stand the idea of staying with Francis, so in that moment she shot him. Besides what she did literally, she also set herself free, physically and emotionally.