It actually sounds quite clear to me !
How I read it is that they have excluded damage to the tubes to her kidneys but are waiting for the results of the urine culture to exclude other kidney problems.
The test for the liver function did not work and will be repeated.
Scans will be done on liver and kidneys and the liver function test repeated.
This is the way all diagnoses are made by excluding the more obvious and then going further until a dignosis is found.
I know it's frustrating, and you want an answer quickly, but these things do take time.
I know for a fact that if this was being done by the NHS for a human patient it would take much longer