Canto 2 -
Ayodhyā-kāṇḍa
Chapter 55: Rāma Leaves Bharadvāja’s Āśrama and Crosses the Yamunā
Text 2.55.7

समासाद्य तु तं वृक्षं वसेद्वातिक्रमेत वा॥

samāsādya tu taṁ vṛkṣaṁ vased vātikrameta vā

samāsādya tu = upon reaching; tam = that; vṛkṣam = tree; vaset = she can tree there; atikrameta = pass on; = or.

Upon reaching that tree, she can stay there or pass on.

If Sītā-devī is tired, she could stay under the tree for some time. Otherwise she could move on [with Rāmacandra].