Karli, I hope you don't mind my resuscitating part of your post of earlier today about the singer. I can remember the gist of it. Your friend was a professional singer. Singing is "closer" to us because we are our own instrument, and I suppose that we can catch on to a number of things "naturally" without learning it as externally as with an external instrument. Thus when her operation changed her body she would have to learn external controls for the first time, or at least to that extent.
Being able to do something, then not being able to it, is the most frightening thing, and it creates great insecurity. I can identify with that because I zipped through the first year of my instrument, then made some drastic changes that were not that visible but changed alignment, forces etc. and could not get that ease back. In fact I went into helplesness and the more I struggled the worse it got. I cannot imagine the blackness of the experience anymore. I'm not even a professional musician.
But to go from when you could play almost without thought, everything moving with ease, and you
know that ease exists, you know this isn't how it should be, but you cannot, cannot get back to the ease - it is dreadful beyond words.
Your friend was then coached into use of her body and overcame her disability. Whatever she was coached into became the framework of how she sings, and frames have borders and limitations.
There is a gift in the disability that befell your friend. If you are a natural, then you will fall into what to do normally, you reach that kind of potential but you don't really surpass yourself. Um, bear with me, this is a half-formed thought. A person who is not a natural will be taught, will learn to use the body in a better way, and will surpass himself, though he might not reach the level of the natural. But if you "can already do it" a teacher may leave well enough alone. Thus a natural, or gifted person, may remain limited because of the gift. (

) It doesn't seem necessary (to many) to teach what is already going well.
With the disability, your friend learned to use her body differently, and to control it. This was a huge contrast to what she had known before. Having experienced helplesness she certainly would not want to fool around with that. One becomes afraid of falling back into it. It's like people who have been robbed realize for the first time that their homes are not as safe as they assumed.
The personal reality becomes, wrong way or right way, before or after. Therefore there is resistance to change. There is dismissing of anything better that appears once in a while, because it doesn't fit into this dual reality - a reality limited to two options.
There is another lesson that your friend's experience can teach, which she has not caught on to. That is the idea that different angles and approaches are each pathways toward growth along a different way. Perhaps there is no final destination that says "now you have arrived". Each angle or method or approach has a tendency to run into opposition of the previous one, and so there is conflict if one is thinking either/or.
But in fact before her accident your friend lived in one dimension. After her accident she was exposed to a different dimension. Singing became a different experience for her, yes? The additional reality is that there are many dimensions, and if one can embrace that multimensionality, then a third reality will have been reached. The first reality involves what we do naturaly. The second reality is that there is one other way of doing it which will change how you experience music. The third reality is that there is not one dimension but many which coexist.
It was once explained to me in the contradictory statement, "There is no technique. Technique is everything. There is no technique." I'd be interested in knowing what you think of this.
In your friend's case I would imagine a very knowledgeable guiding teacher, or in the least, a guide who could give feedback on experiences if she experiments in order to expand. That would give her a safe place, and would also protect her from going off track.