I have one Buff Orpington that lays eggs with either a really rough, thin shell or no shell at all. She has done this since she started laying a few months ago. At first they just had big bumpy spots on them and its progressed to being more and more without a shell. I have 23 hens and she is the only one that does this. I feed Layena pellets with free choice calcium and grit. Also give garlic and acv alternating in their water and give yogurt quite regularly for their good bacteria...am I missing something or does she just have something wrong with her that I can't do anything to help.