So I have a broody hen (no rooster). I do not want to put any fertilized eggs under because I don't want / need any more chickens (I know I heard most of you gasp at that! lol) I don't have a way to put her in a wire cage with the ice cube thing. She is a very mean broody hen... Is there any harm in letting her sit in an empty box until the "broodiness" passes? How long will that take? Thanks!