How is your hen doing now? It looks like she has passed an empty egg membrane. I would give her some human calcium. Calcium citrate with vitamin d is quickly absorbed. If you have that or other calcium or Tums, give her 600 mg daily for a few days. How long ago has she laid an egg? Make sure that she is drinking fluids, and try to get her to eat. She may be suffering from a reproductive disorder or has has an egg break inside. Let us know how she is doing tomorrow. Hens that have a shell-less egg or pass a membrane, may have another one on the way. They may feel weak and listless.