Sobo,
Thanks for the explanation. While I'm familiar with the concept, I just wasn't familiar with the term "focused".
Kevin,
My interpretation of the information presented is that the rope was not attached to the anchor, so I wouldn't say she "had everything setup correctly". I can't imagine how one could have a sling on the anchor and a locked biner on the rope but NOT through the anchored sling, but that is apparently what happened. Maybe when/if the climber recovers, she will remember something about the anchor setup.
A good pre-rappel ritual that may have prevented this accident is to weight the rappel rope while your daisy (or whatver you use to connect yourself to the anchor) is still attached.
When ice climbing, bulky clothing and snow can obscure your view of anchors/rope systems, so be extra careful.