My EE hen, Ladybug, is 6 years old now and she has been laying small eggs this year. She is a very small EE (guessing at most about 3 pounds), but her eggs are smaller than normal. Is it normal for an older hen to lay smaller eggs? Should I add any supplements to help her? I think she has also been eating her own eggs occasionally. They are on the same food they've been on for years with crushed oyster shell and grit.