First and foremost my heart goes out to the victim and her family.

I'm a city boy but I live on the edge of the city....big coyote country. I hear them at night all the time and I run or cycle through their habitat on the way to work. Usually at night. Just about every one I've ever seen turns tail and runs as soon as they notice me. The critters in this attack don't sound like "normal" coyotes.

I'm much more worried about the mountain lions. eek
If you only travel on sunny days you will never reach your destination.*

* May not apply at certain latitudes in Canada and elsewhere.