In regard to the Purushottama the Divine Mother is the supreme divine Consciousness and Power above the worlds,
Adya Shakti; she carries the Supreme in herself and manifests the Divine in the worlds through the Akshara and the Kshara.
In regard to the Akshara she is the same Para Shakti holding the Purusha immobile in herself and also herself immobile in him at the back of all creation. In regard to the Kshara she is the mobile cosmic Energy manifesting all beings and forces.
Ref: The Mother with Letters on The Mother