This morning I unlocked my Cochins and discovered that one of my hens had laid what appeared to be an undeveloped egg minus the yoke or any shell. She walked around for a bit and seemed unbalanced spreading her wings to gain balance when jumping from roosts. She is a little quiter than normal (may be due to winter?) but is eating and drinking as normal. Is there something drastically wrong here or something that can be easily rectified? Many thanks in advance for any help, James.