I have a broody silkie who is currently sitting on one of her eggs. I am expecting some shipped eggs in a couple days. I have her is a dog carrier with a cardboard box tipped on its side and a lip to hold in the bedding. But my hen keeps pushing the egg out of the nest and sitting on it outside of the nest. That's find for one silkie egg but soon she will be sitting on about a half dozen LF eggs. The box helps hold them all under her. What can I do to encourage her to use the nest? She has used the box once before.