Hello and welcome to BYC!
Good luck with your hen!

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Welcome. I agree with @DobieLover and @TwoCrowsHello and welcome to BYC!
I agree with @DobieLover Caltrate is wonderful stuff to harden up shells that don't respond to oyster shell or layer feed. A week on Caltrate once a day always does the trick.
Best wishes with your flock!