Hi, My hen laid an egg without a shell.She was sitting on a roost and was very subdued. We put more oyster shells in the feeder. Saw her drooling. Should I be concerned? She has been getting a lot of bread lately. Someone told me that could cause the soft shell. But not sure why she's drooling? She seems fine other than that - walking around the yard. Someone told us to isolate her - is that necessary. Thanks for any help with this.