This is very unfortunate. Very sorry for the family of this lady.
I am going to list some thoughts and in absolutely no way am I trying to say it was the fault of this lady for recreating.
I myself go hiking with my family and friends in the summer, and always know that wildlife encounters are possible. All wildlife is cool to watch, albeit at a distance, when I am out for general recreation. Sometimes, they get uncomfortably close. Moose and elk for instance, I don't want close to me unless I am hunting, I will watch from a safe distance.
My general take on the predators and wildlife in Colorado (and probably applicable to other states also) is that we continue to encroach their habitat more and more. This is with housing and recreation. Heck, in some areas you have to reserve a camp site months in advance, and dispersed camping is becoming harder to come by as well. We are building trails for hiking and biking. All of this puts more people, day in and dat out in the wildlife habitat.
This is resulting in predators being more comfortable with us. As far as other wildlife, it strains them also. It strains calving areas when people hike in early spring, for example.
heck, I live in the suburbs of Denver and we hear of mountain lions and bears once and awhile. I am 10-12 miles from the foothills, but they wander down this far now and again. This shows me they are more comfortable with human presence overall. If they lose their fear of us, which I think they are doing slowly, humans will have close encounters with some of them, and some encounters have unfortunate outcomes, as in the case mentioned here.
Go out and enjoy, but remember we are the visitors. Be prepared and do some homework before going to an area. Carry bear spray, or other defense. Stay safe out there.