Valmiki Ramayana Ayodhya Kanda Sarga 43 Shloka 3
Original Shlokaविवास्य रामं सुभगा लब्धकामा समाहिता। त्रासयिष्यति मां भूयो दुष्टाहिरिव वेश्मनि।।2.43.3।।
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सुभगा happly, (Kaikeyi), रामम् Rama, विवास्य having banished, लब्दकामा having satisfied her desires, भूयः again, वेश्मनि in the house, दुष्टाहिरिव like a vicious serpent, माम् me, समाहिता accomplished, त्रासयिष्यति will torture me.
Having banished Rama, she is now happy with her desires fulfilled. And like a vicious serpent living in the house she will again frighten me.