I don’t think that giving the calcium after 2 weeks is very good for her. I will let azygous be the judge of that, but she may have salpingitis (inflammation of the oviduct) or something wrong with her shell gland in the oviduct. An enlarged lower belly below the vent may be ascites fluid, but it could also be salpingitis and internally laid eggs that have formed lash material. It is hard to know a lot of what is going on. I usually do a necropsy after I lose one to find out. It is up to you whether or not to drain her. You can introduce infection, and it can cause shock or death is some cases. It can confirm ascites (water belly.) Ascites is usually caused by a reproductive infection, egg yolk peritonitis, cancer, fatty liver disease and heart failure. Some people ask their vets to use a hormone implant to stop laying, but that costs a lot of money, and many vets will not do it due to FDA regulations.