Can you get any antibiotics from your agricultural or farm store? If you have plain Greek yogurt, you can give her a teaspoonful or 5 grams daily for some probiotics. That might help some. Reproductive disorders are very common in laying hens and one of the most common causes of death. I have had hens who had soft or even broken eggs, and they have lived for a year or so until they died from apparent egg yolk peritonitis or related problems. Hopefully, your hen will get better soon.