A couple of thoughts - one if Nala is suffering from kidney disease her stomach may be upset. Ask your vet about giving her some cimitidine (tagament). Second, did your vet discussing using a diet specifically formulated for kidney disease - some are highly palatable and all are designed to be kidney friendly. Third, how are Nala's teeth? Sometimes animals will drop food due to dental disease. Finally, has there been any discussion about giving Nala sub-q fluids?

Hope this helps. Hang in there Beth and give Nala a big hug from myself and my furry family.