the tip of her tail glows blue when she is happy. her collar changes shades based on her mood the darker it is the angrier. if it loses saturation she is sad. if it gains saturation or starts glowing she is happy. Glowy collar = super happy.
OH and on her back feet she only has paw pads on the two center toes. the outside toes never touch the ground while walking/running/standing. the tips of her claws are somewhat blunt.