BigDaddysGurl,
That is interesting about the gold comet.  Did both of the eggs she laid that one day have nice, strong shells?
Just now I found something interesting on Barred Rocks. My chickens are Plymouth Rocks.  It said the Black Rocks tend to have a lot of vigor and are good shell-makers.  From whatI've read, it's highly unusual for a chicken to lay solidly-shelled eggs, when she lays 2 eggs a day.  Usually, when a chicken lays 2 eggs a day, one of them is soft-shelled.  But my chickens' eggs have both had nice hard shells.
I was reading that Black Rocks (I assume that is what my Barred Rocks are?  They are black and white?) tend to be really good outputters of calcium and good layers into old age.  It said that their ability to make good, strong shells helps actually protect them from peritonitis more than other breeds, because they don't tend to lay the shell-less eggs internally that other breeds are prone to, so much.  So now I feel a bit more hopeful as to Esther's prognosis.
Clare