Thanks for your query.
If there is no active peritonral dialysis going on, then the abdominal fluid collection is unlikely to be related to the Peritoneal dialysis
Ascites or fluid in the peritoneal cavity
can be due to a weak heart or liver problems.
I would recommend a 2D Echocardiogram
of the abdomen and a diagnostic ascitic fluid tap.
Based on the results we could make further recommendations.
Hope this helps