She dances in a Dakini-pose and crushes the asura Rahu (the one who devours the sun). Rahu is a snake with a demon head who represents the ascending lunar node. Kurukulla was likely an Indian tribal deity associated with magical domination.
She was assimilated into the Buddhist pantheon at least as early as the Hevajra Tantra, which contains her mantra. Her function in Tibetan Buddhism is the "red" function of subjugation.Her root tantra is the Arya-tara-kurukulle-kalpa (Practices of the Noble Tara Kurukulla).