Cats can purr for various reasons, using the soft rumble as a way of communicating and as a form of self-soothing or even healing. This is why cats will often purr when they're injured, or after a stressful event.
J, L, I, K in order from 9-12
Dwarfism is a condition caused by hyposecretion of growth hormone and would explain her height.
There muscles will keep moving and keep tiring till when they rest it increases there level