I'm glad to hear the OP is having success with retraining! I am having a problem with some new pullets going to bed not because they don't try but because my white leghorn girls, who have been here longer, won't let them come in! Given the chance, the older chickens will roost in the tree next to the coop (I guess that's a leghorn trait) and then the pullets have a chance to go into the coop on their own. Then I have to force the tree-roosters to get in the coop. However, if they are already in when the pullets try to go to bed, the doorway is too small and the older hens run and scare the pullets back out. I'm hoping eventually that everyone will settle down and get along.