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The layer feed already has 4% calcium so I wouldn't mix egg shells into it as that will up the percentage and may create an imbalance. Excess calcium will limit phosphorus uptake and can negatively affect shell quality just as a deficiency can...

Here's some ideas. I'd say she has a damaged reproductive tract. Are you on well water? Has she ever had a respiratory problem? It's not always calcium deficiency but an imbalance of phosphorus and CA or vitamin D deficiency. Is the primary source of food chicken feed? Are you mixing the shells...