Wow this thread is six years old!
Anyway, I'm curious as well. I don't understand the technical names, but I think it's safe to say she now reaches much less high-notes than she used to (well d'uh, Sherlock). Anyway, where was she highest? Was it WHATEVER? Fly high? Connected? She reached the high notes almost effortlessly then. Her recent song which came close to having high notes must be progress, I think?
As for the lowest notes, I think she's having difficulties performing them live, too. The bridges of Lady Dynamite and Last angel were not sung at all (I assume this will be the case with Shake It♥, as well, in the future).
Regardless of the obstacles, her determination to continue singing is amazing. Though I think it might affect her remaining voice.