Salpingitis, EYP, cancers, etc. can have very similar symptoms, but the prognosis is equally poor. The bloated abdomen, whether it is ascites, infectious matter building up, tumors/cysts, or a combination of those things, is generally a sign that her time left is limited. I've lost birds to all of those and often you don't know the definite answer until necropsy. If she is still eating and drinking and acting fairly normal, then I leave them with the flock. Once they go off food and water, isolate themselves, stop doing normal chicken things, are obviously feeling bad and uncomfortable, or are attacked by the flock, then I euthanize. For fluid build up in the abdomen, if you don't want to try draining (I honestly rarely drain due to risks and temporary nature of it) then you can try giving this:
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This is a herbal liver detox liquid which I have found to give some relief
sometimes in cases of ascites. It is also temporary, but less invasive and less risk of shock. It's available at health food stores and online, it has to be refrigerated once opened and is good for 6 months. Dose I use is 4 ml per day for up to 7 days. Once it's refrigerated then let your dose come to room temperature before giving it, don't give it cold. If it works and helps give some relief, then you can repeat if/when the ascites recur. I think it's very likely that your bird has pretty advanced illness, so nothing may really help. The pressure also makes it hard for them to push droppings out, so often birds with reproductive problems will have dirty vents or feathers below. It is also very uncomfortable for them when handled, so be gentle and try not to put pressure on the abdomen. There is also risk of an internal rupture from a fall or hard landing from the pressure inside. I'm so sorry.