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Yes, take her back. Failure to eat in excess of 3 days for a cat can put them into liver failure! They need to start more aggressive diagnostics and treatments...and may give medicine to stimulate her appetite.
Hopefully the change in antibiotics and the fluids will get her over the hump. People/owners need to remember that if we don't hear from you...we think your animal is responding to treatment...never hesitate to bring an animal back that is not responding!