Charlotte was given to me as a 6 pound 6 year old lady, and I've had a wild ride with her health.
At first things were good, but then she started getting diarrhea, vomiting, losing weight, not eating, and peeing outside the litter box. I took her to the vet where I spent $2000 on tests to no avail, so we went with a prescription food.
Even then, she wouldn't touch the prescription food that was to help her sensitive stomach. She kept meowing for food, but wouldn't touch what I gave her. She went down to 4 lbs, which was really concerning.
I tried so many things, until recently I decided to just put some canned chicken breast under her prescription food- my god it's working. She doesn't pee outside the litter box anymore (unless I forget to scoop it), and her weight is back up.
Honestly I just think she hated the food I gave her so much that she would rather die than eat it. I also noted she likes diversity in her food, so I swap between canned tuna and canned chicken mixed with her normal prescription food. She also is much, much happier.
Great that she is eating something again!
If you keep on cooking, keep an eye on the nutrients. Raw chicken hearts are great for Taurine and Vit B12 - and cats usually love them (don't do more than a 2 at one go and maybe only twice a week - can also disturb the stomach a bit, while they are getting used to raw meat)
If you go with cooked muscle meat (chicken (all parts, but without bones!), pig (when cooked, raw it can bring some bacteria, minced meat (beef and pig) seems also to be a highlight)
Look into BARF and the supplements needed, if you can't feed a whole animal.
I'm fighting since 3 months, because my cat wasn't eating and am cooking for him since.
By now we give him 2 antibiotics and an antiemetic as subcutaneous injection daily. And it seems that finally helps - but we often had stable weeks, so I've lost some trust in the good times
Anyway, if you have any questions, I'm happy to answer if I can help