I have a hen who will be a year old at easter, she's been on her nest for about a week, I counted today and she's sitting on 15 eggs. I've made sure she has food and water right in front of her, I'm not sure what to do. Now that's she's been on the nest, egg production has gone way down. I have 12 hens. And I've gone from 11 eggs a day to 6. I want her to hatch her babies but I'm not sure what I need to be doing. Any advice?