Last night when my daughter put the ladies to bed one was on her back. She put her upright and sat her on her knee for a few minutes. She sat for a little while cooing then seemed to realize where she was and hopped down. This morning everyone looked okay, but this hen laid an egg with no shell. Very strange indeed. I bought some vitamins to add to the water and am putting some oyster shell out for them. Anyone ever have this happen to them? I'm a bit worried. And no she had nothing but water to drink last night!