We only got 3 eggs yesterday from our 5 RIR's. When I went out to close up the coop last evening one of the girls was in the nesting box while the other 4 were on the roost. My wife just called me and said that she was still in the nesting box this morning. Could this be a sign of an egg bound chicken? She doesn't seem to be straining in any way just sitting in the box. Any suggestions on what we can do? Thanks