Valmiki Ramayana Aranya Kanda Sarga 61 Shloka 15

प्रियकाननसञ्चारा one who is fond of wandering in the forest, वनोन्मत्ताच mad after forest , सा मैथिली that Maithili, वनं वा or in the forest, सुपुष्पिताम् flowering, नलिनीं वा or lotuspond, प्रविष्टा has entered, स्यात् perhaps.

Sita is madly in love with the forest. She might have entered deep into the jungle or into a fully blossomed lotuspond.