My 4 year old hen came out of molt early February and started laying again. And I got a few great eggs out of her. Now for the past few weeks she will sit in the nest box for up to 2 hours and sing her laying song but there is no egg?! I've even sat and watched her come out and instantly checked to make sure there was no egg. I tried to look it up and I thought well maybe she's trying to go broody on no eggs. So I put a couple of eggs in the nest and the next day they were gone. Not even left over egg yolk residue. I'm at a loss as to what is wrong. I've eve checked her for egg bound. Nothing. Is she retiring? I'm not sure if she's done this before as I just inherited them and have had her for less than a year.