I went to the vets. The vet I saw said it was only one tooth they had to remove. It was growing incorrectly and causing impaction. She assured me that it wouldn't cause any issues in the long run. She looked in the mouth and everything's healing properly, there's no food stuck in there, so it's all going to her stomach. She is also the same weight, so it hasn't gone down. She must've been eating something.
Anyway, so the nurse came in and showed me how to get CC into her. Basically I was just being too soft and letting her get away with murder. She's also playing up for me because she knows I'll give up. So, now I know how to feed it, it's easier. I got a load into her today. She had like 30ml. She is just over half a kilo, so she only needs half the pack of science selective in 24 hours. I'll go feed her the rest in a minute. The vet said 6 small feeds a day.
I have to go back on monday, with the original vet, just to make sure they're happy.
She has 0.8 cat metacam a day.