My Salmon Faverolles has been laying for about a year. About 80% of her eggs have such soft shells that they are broken when I find them. The shells are almost like water balloons. If she does lay an egg that stays in tact, the shell is incredibly thin, especially in comparison to my other girls' eggs. They are on layer feed and have a calcium supplement too. At first I chalked this up to being a new layer, but now it is a year later and nothing has changed. What should I do, if anything?