Sounds like the circumstances of that case are more like people not having adequate respect for firearms. In fact, having killed her brother in a firearms accid

Sounds like the circumstances of that case are more like people not having adequate respect for firearms. In fact, having killed her brother in a firearms accident, I can easily see her spending the rest of her life as a desperate overachiever, and feeling unable to take credit for her success because she "owed" it to her brother. Imagine the depression and motivation that would induce. Finally, having hit such a dramatic obstacle, her previous experience with death would lower her visceral revulsion to the idea of further death. The effects of repetitive exposure to death are well studied in soldiers and healthcare workers.