Beauty is strange

The other day when she was eating I heard her grunting like a pig and this afternoon I heard her groaning quietly. Does anyone know why she was doing that?

Has she been eating too fast or is there something wrong e.g. Beauty being in pain or something?

Some cats make noises when they eat. Kittens will commonly growl or make the "numm numm numm" noises. I think that's a cat's way of saying "yum".
Some cats continue to do this.
My Sho will occasionally grunt and makes little noises.

You should hear a happy box turtle when it gets food it loves, they make squeaky jaw noises and smack their mouths!