So, to continue the saga, I now have one hen dropping soft shelled eggs from the roosting bar overnight. I offer both oyster shell and crushed egg shell free choice. The other hens' eggs are fine. They are all roughly a year old. The one laying soft eggs, Speckles (Speckled Sussex, of course), has laid fine normal eggs before this. She is also producing very wet poops. She seems to be behaving normally. The soft eggs started a few days before I gave the safeguard for worming and the wet poop has gotten more often since. I have given her her own separate treat of oatmeal with buttermilk and egg shell and oyster shell a few times to try and help. And when I try to get her interested in the the free oyster shell she will not have any, even if I get another hen to gobble some up as demonstration / inspiration for her. They eat a good healthy layer feed and do a bit of backyard free range.
Why is this happening? What more can I do? Of course, I am also going on vacation for the next week and will have my aunt pet sitting. I feel like the more I care and worry about these birds, the more trouble crops up. My friends who have backyard chickens seem to be trouble free. Maybe I am just not meant to be a chicken keeper, even though I am Sao fond of them