She could have gotten hit if she was on a pogo-stick, too. But if you're lying in a hammock it's sure going to take you longer to get out of the target zone than if you're sitting on a bouldering pad or standing.
As far as blaming the victim - climbers drop stuff, climbers knock things off ledges, holds break. If you're going to put yourself underneath people climbing, you really don't get to complain if you get hit by something. Doubly so if you decide to hang out relatively immobile - like lying in a hammock.