CC Antya 20.45

eta bhāve rādhāra mana asthira ha-ilā
sakhī-gaṇa-āge prauḍhi-śloka ye paḍilā
Word for word: 
eta bhāve — in that mood; rādhāra — of Śrīmatī Rādhārāṇī; mana — the mind; asthira ha-ilā — became agitated; sakhī-gaṇa-āge — before the friends, the gopīs; prauḍhi-śloka — advanced devotional verse; ye — which; paḍilā — She recited.
Translation: 
In that mood, the mind of Śrīmatī Rādhārāṇī was agitated, and therefore She spoke a verse of advanced devotion to Her gopī friends.