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Hello,Thank you for using Just Answer. My name is***** am a veterinarian and will do my best to help.
I am sorry to hear about Nala's weight loss.
There are 3 things I check for when an older cat is losing weight, eating well, and blood tests are normal. Hyperthyroidism was probably ruled out by blood tests, but check with your vet to be sure.
Inflammatory bowel disease and intestinal lymphoma (a very slow growing cancer) can cause weight loss in an older cat with a good appetite, and blood tests do not tell us about this condition. You need an abdominal ultrasound to check for this, or endoscopy.
Pancreatic insufficiency can cause a cat to lose weight, because (same as with IBD and lymphoma) the nutrients in the food are not being absorbed. There is a specific blood test for pancreatic function done at only one lab (Texas A and M) that is not part of routine blood panels. Again, abdominal ultrasound may also be helpful.
I would try B12 injections; they can be helpful with digestion.
Let me know if this helps and what other questions you have.
I hope you were able to see my responses; I have not heard back from you! How is Nala doing?