Sounds like she might benefit from giving a human calcium tablet with vitamin D 3 orally once a day for a week. Calcium citrate is more easily absorbed with her slow crop problem. If that doesn’t help her egg shells, then her problem may be with her shell gland, or the inflammation of the oviduct (salpingitis) that causes lash eggs. Is she still having the wet drainage from her vent? Several hens who had reproductive issues and died were opened up in a home necropsy. I found ascites (water belly) which causes yellow fluid in the abdomen.