Canto 2 -
Ayodhyā-kāṇḍa
Chapter 78: Śatrughna Punishes Mantharā
Text 2.78.20
तैर्वाक्यैः परुषैर्दुःखैः कैकेयी भृशदुःखिता।
शत्रुघ्नभयसंत्रस्ता पुत्रं शरणमागता॥
tair vākyaiḥ paruṣair duḥkhaiḥ kaikeyī bhṛśa-duḥkhitā
śatrughna-bhaya-santrastā putraṁ śaraṇam āgatā
taiḥ = by [hearing] those; vākyaiḥ = words; paruṣaiḥ = harsh; duḥkhaiḥ = and distressing; kaikeyī = Kaikeyī; bhṛśa-duḥkhitā = became greatly distressed; śatrughna-bhaya-santrastā = terrified in fear of Śatrughna; putram = of her son; śaraṇam āgatā = she took shelter.
Kaikeyī became greatly distressed by [hearing] those harsh and distressing words. Terrified in fear of Śatrughna, she took shelter of her son.
The second line indicates that Śatrughna had even tried to beat her [when she ran away to Bharata in terror].