I understand how you feel and why. If you ask me, I'd say you have every right to feel that way. She made a bad bad call and all her family is paying for that now and will continue for years to come.
We just lost a close friend to a rock climbing accident over a month ago. He was 38, he was the father of three. A very soothing thought to all his friends and family that he left behind is that he really was doing everything he could to climb safely. He loved climbing like nothing else, so he could not live without it. BUT he did it safely! Every single climber who climbed with him said that he was the safest climber they would ever climb with. He would turn around and go down just few feet away from the top, just because the weather would start not being perfect. it was very soothing to his family (especially his parents) to know that he did EVERYTHING HE COULD to be safe. He didn't put himself out there, he did not risk his life needlessly...ACCIDENTS JUST HAPPEN SOMETIMES NO MATTER WHAT. What happened to him was almost unheard of (two super rare things happened one after the other, leading to a fall and instant death). Plus he knew that climbing was dangerous, so he had a good life insurance, so his widow and kids are set for life.
With your friend it is different. Personally I'd feel angry too...