I have a one year old RIR that has been our best egg layer. She rarely misses a day. Over the last two weeks I noticed a reduction in her production...less than half of what she was laying. The last 3 eggs that I have found remnants of have been soft shelled and the girls helped themselves to the innards. There hasn't been a change in feed. She has free choice oyster shell. We did introduce 6 new pullets to the flock about a month ago, but they all seem to be getting along just fine. The RIR is 2nd in the pecking order (from what I can tell). Any ideas?