Yes, I agree with the others. You need to take her to the vet asap. Last year my cat Pepper wasn't eating or drinking and he became jaundice. I had to force feed him and rehydrate him with IV fluids. It was a long couple of months but he fought and won. It turned out to be Megacolon. He was constipated so he couldn't poop and this caused him to have a terrible tummy ache so he didn't feel like eating or drinking. Now he's on medicine for the rest of his life. Thank god it was treatable. Good luck. Please keep us posted.