Loss of Appitite

my cat got some rancid food from a distributer and made her stop eating about a month ago. I have tryed giving her other food and she ate it to fast and threw up. ive given her smaller amounts of food but now she refuses to eat. I have tryed giving her wet food, and cat milk nothing seems to get her to eat again. what should i do it has been over a month sence she has actually eaten.

It is never normal for a cat to refuse food for this length of time. Your cat needs to see a vet as she sounds like she is ill, either from the rancid food or something else.