What Causes A Cat To Not Eat Or Drink?

She is sick. You should give the cat subcutaneous fluids to prevent dehydration. The vet should make an ultrasound, there may be some bowel obstruction. Give the cat some water with eye dropper.  For more information of this subject, visit the link to see comments;
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Did you take your cat to a specialist that only deals with cats? They should be able to help you.