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I agree with all this. You never need to change out oyster shell, just add more when it's empty. Calcium should be available all the time, at least while the birds are laying (I simply leave it out all year regardless). I also use crushed eggshell as some birds don't like oyster shell as...

Do the eggs she's eating have thin or damaged shells? Or does she cause the damage? If shells are thin I'd try to fix that first. Is the Purina feed a layer feed or what kind of feed is it? How much scratch are you giving them? You could use rollaway nest boxes so she can't reach the eggs...