I can hardly put this into words, but little Lulu is in trouble.
She went into the nest boxes this morning and stayed about 4 hours.  No egg.  She came out on her own and wandered around but looked bad (tail down, not moving fast).  I gave her some calcium pills and had a feel around but I cannot feel an egg, so if one is stuck it is stuck higher up in the system.
She went back into the nest boxes this afternon for another couple of hours.
Still no egg.
She is out now but not looking great.
I managed to get some more calcium into her but I have a horrible feeling of impending doom.
If I lose Lulu I think I really need to rethink keeping chickens.  I just don't seem to be very good at keeping them alive.  Or maybe I keep a much larger number and care more about the flock than the individual and accept losses as just one of those things that goes with keeping chickens.
Poor little Lulu - I knew she was too young and too small to be laying eggs (albeit very small ones).