As someone who works with a lot of nurses (in the US, but I doubt the UK is much better) she was probably incredibly dehydrated. Overworked nurses don't stop to drink water so they don't have to stop to use the restroom, for some it is almost a point of pride. If she was doing the standard 12-13 hour shifts, going home, sleeping, back to work three days in a row, or more if she liked overtime? Kidney issues. To then get pancreatitis on top of that, which causes further dehydration? Perfect storm.
I wouldn't be stupid enough to say it wasn't the glp-1, but there were almost certainly other factors at play here as well.