In spite of getting plenty of calcium in her feed, she may just not metabolize it properly. She may need Vit. D. Which is why giving her a Calcium +D3 tablet every day for a week may help her. Many of us provide a commercial feed low in calcium but high in protein, with oyster shell on the side, rather than a feed containing oyster shell. By providing OS separately each hen can take what they need, as they need it. Ther own bodies tell them how much to ingest and when.
I don't really understand what you are feeding. Is this something you formulate yourself? Often when provided whole grains, chickens will pick and choose what they like best and leave the rest. When they do this, they don't end up with a complete, balanced diet. That's why a commercially prepared, scientifically formuated pellet or crumble is recommended. They can't "pick the best, leave the rest."
I don't really understand what you are feeding. Is this something you formulate yourself? Often when provided whole grains, chickens will pick and choose what they like best and leave the rest. When they do this, they don't end up with a complete, balanced diet. That's why a commercially prepared, scientifically formuated pellet or crumble is recommended. They can't "pick the best, leave the rest."