Is Princess getting regular SubQ fluids?
What food is she eating & what have you tried to get her to eat when she's not feeling like it?
How much does Princess weigh & what is the dose of Azodyl you are giving?
How are you giving it to her - pilling compete capsule or opened sprinkled on food?
Is the bottle kept in the refrigerator?
The abscessed fang would not be directly related to the CRF, it would however explain, at least in part, her not wanting to eat as that would be rather painful - is she on antibiotics & pain meds for this after it was removed?
Avoid biting when a simple growl will do
The Spirit Lives As Long As Someone Who Lives Remembers You - Navaho Saying
Vindication ~ For all those pets who became sick or lost their lives from tainted pet food