Hi my family and I are new to chickens and all that goes with it! We have 5 hens and 1 rooster. 4 of our hens lay consistently 3/4 brown eggs a day. Our 5th hen isn't laying at all anymore. It's been since mid August since we've gotten an egg from her. Even when she was laying they were small (blue/grey) and she only laid a couple a week. Any ideas on what's wrong or what we need to do?