Update:
Tiger is at the vet right now for the radiation iodine treatment. Uranalysis done, ultra sound done today before admitting her. Kidneys look good. Her liver has some damage, which we figured. The vet told us there is a medication that can help to repair the damage to the liver which she is going to be putting Tiger on, and she is changing the antibiotic she is on for her bladder infection to what she considers a better medication (I do not remember what it is), but it also won't interact with the medication with for the liver. She said Tiger is a really good candidate for this as well as for the liver treatment. So overall we have some very hopeful news. They gave us a bag of the special litter to bring home. I'll be picking her up on Monday.