While Mary was cleaning (Past Progressive) up her room, she found (Past Simple) the ring she had lost (Past Perfect) two days earlier.
While Mary was cleaning up her room,she found the ring she had lost two days earlier.
While Mary was cleaning (Past Progressive) up her room, she found (Past Simple) the ring she had lost (Past Perfect) two days earlier.
While Mary was cleaning up her room,she found the ring she had lost two days earlier.