If her kidneys are starting to fail adding salt is one of the absolutely worst things you can do to her. Stop experimenting on your cat, take her to the vet, have blood work done and find out what the issue is so you can treat it properly.
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Holly, Misty & their friend, Jake, the dog.
Onyx, Callie May, Maggie & Kobi forever in my heart.
Yes, I know I need a new signature pic...someday...