I would expect such an experienced and solo hiking outdoorswoman to have a GPS(watch) with her. Newer models can be accessed from a laptop/pc to find its nearest known location, and some can even send out an emergency notification to an paired cellphone if the watch breaks after a fall/crash for example. I wonder if she had one of those, it might be a great help in locating her.
Also, its not really clear to me if she did reach the refuge she was planning on staying that last night or not. Did she ever made it there?
I'm hoping she had extra clothing, an emergency blanket and water or a water purifier with her and is taking warm shelter somewhere with an injury or so. Fingers crossed she will be found alive!
Is it expect to be foul play or an accident at this moment?