i don't really think it was her fault. they DEFINITLEY should have had some kind of warning or barricade around the open hole.
now, if she was looking at her phone and walked into traffic, well thats just dumb... ;D
see, traffic, cars, buildings, curbs, etc are things people consciously avoid walking into, but i don't think people consciously avoid manholes because 99 percent of the time there is a cover on them, or at least some yellow tape or a cone.