I am very worried that she is not eating normally.
Loss of appetite is a big red flag in cats. Why?
When a cat goes just a few days without eating properly, they break down their fat. We would all do it. But, cats place fat into the liver causing much more severe illness called hepatic lipidosis (fatty liver syndrome).
Also, the being wobbly, also called being ataxic, is a red flag. That suggests she is off her equilibrium, and that could be caused by many ailments including being very weak and/or dehydrated.
I'm not sure about her voice being rough, which could possibly point to a respiratory infection.
The combination of these symptoms absolutely warrants a vet visit, because I know we cannot manage KittyP with at home therapies, and taking a wait and see approach at her age could be dangerous.
I wish I could do more, but definitely, she needs to be evaluated.