Valmiki Ramayana 2.109.25
स्थिरा मया प्रतिज्ञाता प्रतिज्ञा गुरुसन्निधौ ।प्रहृष्यमाणा सा देवी कैकेयी चाभवत्तदा॥
sthirā mayā pratijñātā pratijñā gurusannidhau |prahṛṣyamāṇā sā devī kaikeyī cābhavattadā ||
Our plain-language meaning of this verse is waiting for scholar review.
Open in the book