I have two RIR hens I bought as 6 mo. old pullets. I've had them for about 2 months now and they both have been laying for about 6 wks. Now one of them has stopped laying, stays almost all day in her nest box. This has been going on for about a week now. The other one is behaving normally, goes outside, eats, lays eggs ect. Could she be egg bound? I've tried palpitating her abdomen, but I don't really know what I'm doing and I don't feel anything like an egg there. Any advise? Thanks. Tim