My hen went Broody while we were away, so I'm not sure exactly which day she started. I do know she's been sitting for more than 21 days now, though. How long do I let her go over? The eggs should be fertile so I don't know what went wrong. I have eggs that should be hatching in the incubator tomorrow. Should I try to slip those chicks under her and call the eggs she was sitting on a loss?