Given her age I do feel it is time to consider a trip to the vet for some baseline bloodwork. My concern here is kidney disease, diabetes, liver disease and hyperthyroidism which are all common in our aging cats. These can cause the finicky appetite, vomiting, and lack of appetite altogether. This would be the best place to start. Acting hungry all the time is consistent with hyperthyroidism as is the vomiting if she is just eating way too fast. This is easily treated with daily medications. Kidney disease is what usually leads to a picky appetite and also vomiting.
Please let me know if further assistance is needed.
Theresa
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