She has passed a malformed shell-less egg. Can you gently try to pull the rest out? How long has she been laying? Are you feeding layer feed, and do you have crushed oyster shell available? I would get some human calcium citrate with vitamin D, and have her swallow one daily for the next week? If you don’t have that use any type of calcium or Tums today, then get some tomorrow.
We had someone come and dig to burry cable. She was very stressed during the loud noise. Possible it is stress and not a deficiency? She is seemingly fine now