One of my barred rock hens is a year old and had been successfully laying eggs at a good rate. I should add that the eggs were thin-shelled despite having oyster shell readily available. She stopped laying eggs and I was concerned about her. I monitored her and thought that she might be suffering from a calcium deficiency so I fed her some Tums. I could feel an egg in her, I gave her a warm water bath. The next morning I found an egg under her roost, but it was gelatinous, not at all hard shelled. Later that day I found another egg in the nest box, a miniature egg. That was about a month ago, she had not laid eggs since then. This hen is otherwise healthy, eats well and is active. Her disposition is just like my other barred rock hens. I assumed something malfunctioned inside her and I now had a hen that was pretty much a pet. Two days ago I found an egg in the morning, and I knew it did not come from my other hens, and yesterday and today the count was an egg from each hen. So she is now laying again. Any thoughts?