Look the links I gave you have numbers for no-kill shelters on it, please ring them all until someone will take this cat. Something sounds very wrong and waiting another 48 hours will make things worse not better.

Please take this poor sick cat to somewhere for help be it an emergency vets or a shelter.

At the very least ring up the emergency vets for advice. They will tell you over the phone what they think it is and how much it will cost and if she is suffering or not.

Don't forget that cats are use to hiding pain until it becomes unbearable, so by the time this cat stops eating it could be too late to treat her