My buff orphington has gone broody. She's been sitting on everyone's eggs for about 4 days now. We don't have a rooster, and only have 3 hens. I'm wondering if i just get 2 newly hatched chicks form the farm supply and swap them out with her eggs at night if she will raise them? Does anyone have any experience with this? Will I have to seperate them from the other 2 hens?