Hi & Welcome.
I appreciate your concern for your beloved sister.
Incomplete data: Age, any other disease, any relevant lab tests.
Suspected
liver disease with complications.
After having gone through the problems described in your query, I am of the opinion that she is suffering from the liver disease (?
Cirrhosis of the liver) which has caused the accumulation of fluid (water) in her abdomen (stomach) and enlarged
spleen with decreased platelet counts and the lining of the lungs as well.
She needs to be treated in a hospital setting for her present condition with water pills (diuretics), nutritional supplements (
vitamins, minerals, etc), and of course the cause of reduced platelet counts should be detected and treated accordingly.
Hope to have answered the query.