Then Sítá, best of womankind, Ascended, with a tranquil mind, Soon as her toilet task was done, That chariot brilliant as the sun. Ráma and Lakshmaṇ true and bold Sprang on the car adorned with gold.

In plain words: Once she is ready, Sita calmly climbs into the shining chariot. Rama and Lakshmana jump in after her.