My 11 month old Silkie hen has not been leaving her nesting box at all lately. Normally her and my easter egger forage in the years together, but the past week she has only left her nesting box when she is carried out of it. Her eggs have had very weak shells. The only thing that has kept her inside before this has been cold weather, but the weather has been nice lately. We are starting to worry about her. Please help!