Veterinary questions? Ask a Vet for Answers ASAP
I am sorry to hear Poppy hasn't been eating. There are many different things which can cause a change in appetite with cats. Have you noticed any vomiting or diarrhoea? Have you seen any changes with thirst? Is it possible she could have eaten anything she shouldn't do? How old is Poppy? Is she an indoor or outdoor cat?
There are many different issues which could be going on. she has quite non specific (vague) symptoms of illness. Cats are prone to developing a number of different illnesses including kidney disease, infection within the gallbladder/liver and gastroenteritis. I would recommend that you offer her some small amounts of a fresh/bland food such as boiled chicken, white fish. You can also offer foods which are stronger smelling such as tuna fish to tempt her to eat. I would advise that you have her seen by a vet tomorrow as she will require treatments to help her appetite, depending on what has been the cause. Sometimes treatments may include injections of antibiotics, anti-inflammatories, pain medications and sometimes IV fluids are required. If she has not eaten in a few days, fatty deposits in the liver can occur (hepatic lipidosis) so the longer she doesn't eat then the more likely she is to become unwell. I hope she feels better soon,