She is CKD patient. She is not feeling hungry because she is having trouble breathing properly.
If that is the case, then you must take her to your nephrologist. He will put her on a slow dialysis, where you can remove more fluid, making it easier for her to eat and drink.
There are many facts, I will need to know to tell you anything else
Health Tips
Go through her nephrology consultation, prescription. there may be information you need to know.