I finally found some calcium citrate tablets and after two days she layed a good egg that wasn't crushed. However there are other variables. I have introduced our 4 black australorp chicks this week and last night had to put two hens into solitary confinement beca6they were being extra rough on the new girls and even pecked me and drew blood! So since they were separated from the flock they weren't there to step on or crush the egg or possibly be bullying her too?
BUT the two hens I separated didn't lay eggs today...is that because I put them through a change of environment?