My 1 year old red sex link, Henrietta, has suddenly began to lay weak or soft shelled eggs every day for about the last two weeks. She has been a wonderful layer. My chickens have always had free-choice oyster shell, and a good quality layer feed...plus I occasionally will give the girls some of their own eggs shells that have been baked and ground up. She is perfectly fine otherwise and is one of our favorites....we have 5 red sex links. Any ideas? This has been sudden....but has gone on every day for the last two weeks.....and she has never missed a day of laying since she began at about 18 weeks. The bad thing is...she has a tendency to eat these eggs once she drops them.....I watched her the last couple of days lay the egg....you can pretty much time her laying to the minute.....I wonder what the deal is....I make sure there is plenty of calcium available....I would appreciate any ideas or suggestions....thanks