Glad you are having her seen by the vet. Here are some of the symptoms that can be seen with reproductive disorders, such as internal laying, salpingitis, egg yolk peritonitis, ascites, and cancer:
http://www.theveterinaryexpert.com/backyard-poultry/egg-yolk-peritonitis/
http://www.poultrydvm.com/condition/egg-peritonitis
http://www.theveterinaryexpert.com/backyard-poultry/egg-yolk-peritonitis/
http://www.poultrydvm.com/condition/egg-peritonitis