As far as we know, the renal failure didn't show up, until after she was in the hospital with the low blood glucose. Insulinomas is exactly what I was thinking, though I didn't know the word for it. I just did a lot of reading and used a little deductive reasoning. One question though... Her glucose levels have increased and, now, stabilized. If Insulinomas, or any of the other potential causes, are present, could her glucose levels have stabilized like they did?