I have a Cochin who can't see very well (probably a birth defect). She knows where the food and water is and gets around just fine. She is now laying and I find her eggs very thin. This worries me. I give her veggies daily and offer calcium, but by the look of her eggs shell she might not be taking in enough calcium. I give her layer food, but I offer all my chickens extra calcium if they need it. What can I do to help her? I don't know if she knows where the extra calcium is. I don't want her to be eggbound or calcium deficient. Thanks.