What kidney food are you feeding her?
I went through this with Bullitt.
Refused Science Diet Kidney, both canned and dry
Tried Purina Kidney, refused both canned and dry
I did a kidney home cooked diet and he ate that for quite a while and quit eating
He is now eating Royal Canin LP kidney diet, canned food. When you open the can it actually smells like dog food and he's eats it well.
It is not uncommon for kidney dogs to have eating issues. Bullitt goes through spells where he will eat three small meals instead of two big ones. Some days he only eats one meal but eats a bunch the next day.