Hope the girl gets better soon.
HSE/AALS and the local Sheriff will be undertaking a full investigation of the incident – as they should if something like this happens.
For information, the bridge is a road bridge.. It does have hills down to it at each end and sharp(ish) corners at each end. To have fallen that far suggests that she went over the parapet in the middle, not onto the rocks each side. It's a scary long way down.
Thankfully the outdoor industry is incredibly safe in general. I feel for the staff involved, working in the industry myself.