My easter egger has been laying eggs with weak shell recently. We started to give her oyster shells but today I found most of an egg that was cracked and she was in the nesting box with a chunk of egg shell hanging from her butt. We got what we could see out. I saw something about warm baths, but she was very resistent. She has been drinking and walking around and seems pretty much fine, but I don't know if there are antibiotics or something I can do to prevent infection.