ఈ అద్వైత స్ఫూర్తియే బ్రహ్మ జ్ఞానం. అటువంటి జ్ఞానాన్ని మనలో పుట్టిస్తుంది కనుక బ్రహ్మ జననీ అన్నారు.
You cannot think of Shiva and Shakti as two separate entities. Shiva is Shakti and Shakti is Shiva. When paramaatma wants to express himself it is Prakriti(Nature). Paramatma is present inside every part of prakrithi. So, the body and the soul are not two different entities. Body is Vimarshamsha and soul is Prakaashamsha. They both are part of Paramaatma. That means in reality, there are no two things. It feels like two because of ignorance. Dwaita means 'Being two'. 'A' means 'Not'. Adwaita means 'Not two'.
Realization of Adwaita is knowledge of Brahma. Because she leads to such knowledge, she is called Brahma jananee (mother of Brhama).