While this battle is taking place, Sita takes refuge in a cave, and Lakshmana stays guard. When the battle with the demons is over and Khara has also been eliminated, Sita emerges from the cave. She is very pleased with her husband’s acts of courage, and here Valmiki refers to Her as Vaidehi. Now that Rama has got rid of 14000 demons all alone, Sita is pleased at this proof of His courage. That is why Valmiki now uses the name Vaidehi — meaning daughter of the King of Videha — here.

Source: The Hindu September 26, 2019 15:56 UTC