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Hello. I'm sorry to hear about your cat.
I would also be concerned about her. 2-3 days of vomiting and decreased appetite is worrisome. I would definitely want bloodwork to see if this is kidney disease, diabetes, liver disease or a foreign body obstruction.
I understand that you can't get her to a vet. At home, you can try an over the counter anti-nausea med. You can give Pepcid (Famotidine) 5 mg 1-2 times daily. You can also give Meclizine (Antivert) 12.5 mg once daily.
I would also try to syringe some puree food and pedialyte to get nutrients and fluids in her.
I hope this helps, let me know if you have any other questions.