Miss Kiran said, "Do your work quietly."

Miss Kiran said to do our work quietly.

Miss Kiran asked us to do your work quietly.

Miss Kiran asked to do your work quietly.

None of these

In reported speech, the imperative sentence "Do your work quietly" is transformed into an infinitive structure (to do our work quietly).
The pronoun "your" changes to "our" to reflect the perspective of the speaker.
The verb "said" is replaced with "asked" to convey the request.