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Shouldn't * be to much i mean, not should..

I gotchya. I took it as the feed itself contained oyster shell until you said it was seperate and the feed didn't calcium.

Well if the feed doesn't have calcium, the oyster shell should be to much. It may give her a better balance of levels with a feed that contains calcium already in it, minus the oyster shell, though. What feed are you currently using? But i agree with above comment. Its likely simply genetics.

Extra calcium (oyster shell) really isnt needed for the ones that weren't laying yet either. Extra calcium is really only needed whenever they actually start laying. Excess calcium really isnt needed period if their feed contains it, unless they show signs of a calcium deficiency. To much is...

Yes, genetics sound highly plausible. To much calcium (oyster shell) can also lead to over production. Does the feed have calcium suppliment plus oyster shell, or is oyster shell the main contribution of calcium?

It could potentially be a problem, however some hens are just prone to it and theres nothing than be done to help. It could be in their genetics, it could be a hormone imbalance, over feeding, etc. The only thing that can be helped is the over feeding of laying pellets that can be to much for...