Ascites is always a symptom of something more serious. It's not a disease. But it can be relieved temporarily by aspirating some of the fluid from her abdominal cavity with a large gauge needle syringe.
She could have both issues, the internal laying causing liver failure. No, there is no treatment you can do. If you have lots of excess $$, an avian vet can operate, clean out her abdominal cavity, and install a hormone implant to stop ovulation. With that, you would end up with a very expensive...
Ascites is a swollen abdomen between the legs that usually pushes the legs apart so the hen has a wide stanch. When such a hen walks, she has a noticeable "penguin"walk. Does that description match up?
What I'm suspecting is internal laying. For some reason, a hen can begin to divert her yolks...