Bambi, I will chat to my friend later in the week.
If I were you I would probably try and ask drs lots of questions, especially on ALL possible options regarding the treatment.
Afaik, kidneys being at the end of the process of clearing out metabolic end products wouldn't be failing without a reason (my ds was at hisk of hemolytic anaemia so I had to look into it a bit in the different way).
Has your dd had a totally normal liver function tests? Was it possible to establish that she may have had e-coli to explain the kidney problem?
My ds liver function was low and he had a risk of kidney damage b/c of that. There is one enzyme called G6PD which can lead to hemolytic anaemia, it's one of the enzymes that process glucose and deficiency is apparently common but often symptomless at early stages.
eg here
This may not be what's affecting your dd, but if I were you I would try and get copies of any tests and look through them yourself too.
Or, has a possible autoimmune cause been mentioned? That would be another line I would investigate.
Kidneys shouldn't be failing w/o reason, there might be something earlier in the metabolic process that is possibly not working as it should putting a lot of stress on them. I know people can live with one kidney and of course on dialysis too, but maybe there is a way to avoid it by exploring all possibilities.
Talk to the drs about all angles and find out what else they may have found out about your dd metabolism apart from the fact that they biopsied the kidneys.
I was in a desperate place with my ds where drs told me there was absolutely nothing they could do, but we managed to reverse some damage through diet and my ds is doing far better then expected.
What are the timescales for your next appt?