From Monica Bretherton:

I too got to visit Ms. Whisper today. 

http://blog.seattlepi.nwsource.com/horsebytes/archives/158317.asp

Forget champagne, New Year’s from now on will be about the sweet smell of alfalfa!

Met, Whisper was up and eating, so there was no need for her to be wearing the helmet while I was there. However, it was standing by outside the stall, so presumably they are still putting it on when she is in the process of being gotten up. It is still a major effort, Dr. Hall said..

The real turning point will be when she shows more use of her hind end in getting up. She is still only working with her front legs.

It’s still a mystery, but one that is being closely observed for small signs of improvement.