We have two hens about one and a half years old. One lays regularly-pretty much every day. The other has not laid in two weeks. She is not molting nor is she broody. She is eating a little but not a lot. We lost our third hen a few weeks ago to an unidentified illness. She was laying every couple of days at that point-still not what we were getting just a few months earlier. How long is "too long" where a short break in laying should actually be considered an illness?