Canto 1 - Boyhood
Bāla-kāṇḍa
Chapter 64: Viśvāmitra Falls Prey to Anger
Text 1.64.2

तथोक्ता साप्सरा राम सहस्राक्षेण धीमता।
व्रीडिता प्राञ्जलिर्भूत्वा प्रत्युवाच सुरेश्वरम्॥

tathoktā sāpsarā rāma sahasrākṣeṇa dhīmatā
vrīḍitā
prāñjalir bhūtvā pratyuvāca sureśvaram

tathā uktā = spoke to her thus; apsarā = that apasarā; rāma = O Rāma; sahasra-akṣeṇa = thousand-eyed Indra; dhīmatā = when the intelligent; vrīḍitā = bashfully; prāñjaliḥ bhūtvā = joined her palms in supplication and; pratyuvāca = replied; sura-iśvaram = to the king of the demigods.

O Rāma, when the intelligent thousand-eyed Indra spoke to her thus, that apasarā bashfully joined her palms in supplication and replied to the king of the demigods.

Rambhā was bashful as she wanted to convey that it was impossible [for her to execute their request].