I also wouldn't call the rest of the peloton "unfortunate." They knew keeping track of the breakaway would be especially important given the lack of radio communication with a director in a team car, and they still didn't. I think Kiesenhofer deserves a ton of credit for this win; she was in the break from the very start of the race, and she was solo for over an hour, I believe. You can't do that without a lot of dedicated training and preparation. If anything, I think this is an example of "shoot your shot." You never know when things will break your way!
Part of the reason I love cycling races is that it's a combination of athletic ability and strategic thinking that you don't see in most other sports. The physics of drafting mean that a well coordinated group almost always has the speed advantage over a lone rider, but lone riders often win races because they don't have to deal with the coordination problems of a group. After 4+ hours of racing, people are trying to calculate optimal game theory decisions while at their max heart rate. It can be bonkers to watch!