If it was just thin shells then yes, I'd say up her calcium a bit and see if it helps. But I don't like that cooked egg appearance of the broken egg in the picture. That's what makes me thing something more is going on. Unless that's just membrane? Did that egg feel soft or was it hard?
The other issue is if she retains any bits of broken egg shell she may develop an infection. If that happens she would most likely start acting slow and not feeling well. You can treat with antibiotic's if that happens.
The other issue is if she retains any bits of broken egg shell she may develop an infection. If that happens she would most likely start acting slow and not feeling well. You can treat with antibiotic's if that happens.