This is terribly sad, but if anyone knows the risks inherent in this kind of work, it's a stunt performer. They invariably plan each stunt very carefully, and never undertake the dangerous activity without being very confident they can do it safely.  But, sometimes, human error or something unforeseen intervenes.  Stunt men and stunt women accept this reality as an occupational hazard. Not many of us civilians would dare to do what they do.  It's a bit of a cliche, but  she died doing what she loved the most.  You would have to really love this work to take that kind of risk.