Valmiki Ramayana Ayodhya Kanda Sarga 44 Shloka 6
Original Shlokaअरण्यवासे यद्दुःखं जानती वै सुखोचिता। अनुगच्छति वैदेही धर्मात्मानं तवात्मजम्।।2.44.6।।
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सुखोचिता used to comforts, वैदेही Sita, अरण्यवासे living in the forest, यत् दुःखम् those hardships, जानती वै knowingly, धर्मात्मानम् virtuous, तव your, आत्मजम् son, अनुगच्छति is following.
The daughter of Videha (Sita) who was used to comforts has knowingly followed your virtuous son into the hardships of forest life.