How horribly tragic

If I could talk to your friend though, I would tell her to please not be hard on herself. Sometimes no matter how hard you try to take precautions, things happen. It doesn't mean she was careless or irresponsible. It sounds to me like things just happened to go in a bad way from simple human error and circumstances. I know there have been times when something little happened that could have turned out a lot different depending on circumstances.

I know it must be so so awful, and so hard for her not to blame herself. I feel sick at heart for her and her terrible loss.