I have two Bantam Silkie hens aged 6 months. They have been laying eggs regularly for about the past month. One of the hens regularly escapes to next door where there is a cockerel. The other hen has now started brooding on the eggs and is not coming out of the nesting box. Does anyone think she may be waiting for a fertilised egg to hatch, even though it will be the other hens egg? Will she come off the nest to eat and drink? Every time I check on her she doesn’t seem to have moved.