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The membrane is nearly all protein, if I remember right. And, yes, feed that too. She will need more than the shells of her own eggs. Sometimes people save the shells from store bought eggs for me. Sometimes mine get calcium I buy for them... so far, oyster shell or the calcium added to feed...

Size of a sesame seed is not big enough even if it is rock. I'm guessing she is feeling the need for grit (rock) in how her gizzard feels and trying to fix that. Can you get gravel, maybe from outside? Having a range of sizes would be best - 5mm-6mm and bigger. Edit to add: oh. The internet...

If we (you, us, or both) can't tell from looking at it or the packaging, you can probably tell by putting it in vinegar or lemon juice. Calcium will dissolve, rock will not. It will take some time - maybe a day or a few days. I can put some oyster shell in vinegar to get an idea of timing. It...