Good tidyings to you

My daughter can talk under water. She never stops. She was in the shower the other night singing at the top of her lungs. I was listening in as she was cute.
She was singing: "I wish you a merry christmas and a happy new year."
then she goes "Good tidying to you"
and then stops and says out loud.
Good tidying, wonder what that means. Oh it must be 'cause you tidy your house before people come at Christmas.