Bears will attack, there is no doubt bears are predatory if they see fit, but more often then not bears would rather take an easy meal because they need the weight packed on before winter. Chances are she either spooked the bear, or something else caused the bear to become violent before she came across it. This is the typical and most common cause associated with bear attacks from what I have been able to find in research. Now most bears that I have seen and heard huff while breathing, something you can hear if your paying attention to your surroundings, but the one I ran nose to nose to was not huffing or I would not have walked in to her. Huffing sounds something like their short of breath with a bit of grunt and rasp mixed in unless they are actively stalking, then they can be deathly quiet. I also freely admit all my experience is from brown bear in Alaska and I have only come across maybe a dozen total.