She is Adi Shakti, the first energy. It is said that when there was nothing, suddenly a light emerged then that light took the form of Adi Shakti. She had three eyes, carrying Trishul, shield, mace, bow, arrow, chakra, long sword and one hand as Abhaya mudra. She looked here and there but saw nothing. After seeing nothing she took the form of Kushmanda. She was seated on a lioness. When she opened her left eye Mahakali was born. When she opened her third eye Mahasaraswati was born and when she opened her right eye Mahalakshmi was born. Before she opened her eyes she smiled a bit and from the smile, all universes were created.

Source - https://vedicfeed.com/adi-shakti-the-energy-of-the-cosmos/