My 10-month-old RIR is turning into a very unpredictable layer. Tonight, when I went to lock up the coop, she was sitting in the nest (which none of my girls has EVER done at night), and had just layed a warm, rubber-shelled egg. What's up with THAT? Shouldn't she know better than that by now? I'm sure the egg would have been just fine if she'd held onto it 'til morning. Her eggs are every shape, color, and size. She was my most regular layer for the first several months, but now she's the worst. It makes me wonder if there's something wrong with her. Edited to add: I forgot to mention that, a few days ago, she layed a double-shelled egg (with the outside shell being rubbery). Anybody have an opinion on what's going on with her?