She is following the scent of her kill, which was not where she left it. She appeared to me to be moving with fierce determination. Her ability to follow the scent must be very powerful, there was no hesitation in her movements.
The eland is a large spiral horned antelope. They can form herds of up to 500 individuals. When they move as a herd they are accompanied by a clicking sound which some believe is the sound of the two halves of their hooves coming together when raised.