I'm sorry that she's experiencing this...I've never heard of the disorder before and it sounds like a very frightning problem to have. Here are some references to it (maybe the first the webpage you referred to):
http://cantbreathesuspectvcd.com/
http://en.wikipedia.org/wiki/Vocal_cord_dysfunction
I wonder, if the treatments are therapy-based, it might be that for some reason they take longer to take effect in her case and might still have some benefit if they are still pursued. What does her doctor think?