Is she able to walk and get around to food and water? Have you tried giving calcium to her? Calcium citrate with d3 is very good, about 600 mg daily, and can help pass an egg or lash egg. Salpingitis can be acute or chronic, and some hens can live awhile with it. Some of mine would stop laying on their own, and live a few more years. When I lose a hen, I always do a home necropsy to look for what was causing their illness. Cancer, egg yolk peritonitis, and ascites have been common findings.