रामपरीक्षावर्णनं नाम चतुर्विन्शोऽध्यायः
Rama testing description Chapter 24
Brahma said (to Narada)
आदिशक्तिः सती देवी शिवा सा परमेश्वरी |
शिवमायावशीभूत्वा पप्रच्छेत्थं शिवं प्रभुं || 35 ||
That primeval energy supreme Goddess Sati, Shivaa, under the control of Shivamaya (the force of illusion/confusion) asked God Shiva this (question).
The supreme Goddess Uma is Shivamaya herself. When she takes a human body in the form of Sati, even though a full incarnation, she becomes subject to the force of illusion. Even God himself in human form was affected to a small extent by this force.