I am a Shakta, and for me, MAA (an informal word a child uses for its Mother, like “Mama”) is the representation of Infinite Being, of pure existence from which all things emerge.
Essentially, we are all MAA, we are all just in different phases/states/stages of realized awareness about the nature of Her existence. The best of gurus teach their disciples to listen to their own Atman (and how to listen, through sadhana) as the supreme guide, because Atman is not separate from Brahman/MAA/Infinite Being (these words are interchangeable), rather than relying on them totally. They may give us guidance and advice, but ultimately they will encourage us to first begin to hear, and then begin to listen to MAA directly. We must each come to our own realization, do our own sadhana, make our own mistakes, and release our own “I” in order to emerge from the darkness of non-awareness.