She is the one who actually creates maya for gods and teaches them what to do and what not to do so that they can be connected to the ultimate God. She helped Lord Vishnu to slay the demons Madhu and Kaitabha to save the world. Moreover, she is also the one that who takes Lord Vishnu to mystic sleep hence called Yog Nindra of Lord Narayana. It is required by yogis, sages and bhaktas so that they can be connected to God. She is a form of goddess Parvati and is called Vindhyavasini.