The Courier article states that she didn't make contact with any rock on he fall, a straight fall from the bridge into the water – impressive in it's self.
Climbing in and out of the gorge there is difficult – I've paddled that section a number of times. The access point certainly focuses the mind.
I certainly wouldn't want to fall off Rumbling Bridge, and I have seen the whole structure, including the road surface, encased in a thick carapace of ice during sub zero conditions. Perhaps similar conditions yesterday?
All in, a remarkable take of survival, with a massive dose of luck.