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Hello. I'm sorry to hear about your cat.
It sounds like she is in rough shape. If it's been 3+ days and she hasn't eaten anything, she is likely pretty dehydrated and malnourished. If you can get some water and canned food into her, that would help. You will likely have to syringe it.
Ideally, I would get her to a vet where they can get her on some IV fluids and probably tube feeding. That would give her the best chance of surviving the immediate future. If that's not an option, I understand. In that case, do all you can orally to get fluids and nutrients to her. If you need to get a spike in her glucose to perk her up, you can rub honey or karo syrup on her gums.
I hope this helps, let me know if you have any other questions.