Edited by janf1914 - 3/26/16 at 12:18pm
Given her age, it could be Ascites (water belly) or Peritonitis where the abdomen fills with fluid. The fluid can put pressure/strain on internal organs and cause breathing problems. There is no cure, some people do drain the abdomen with a needle (I believe 18gauge). Ascites would drain as more clear liquid while Peritonitis will be thick yellow liquid.