Is your hen loosing weight at all? This may just be my fuzzy memory but the hen I have now doesn't seem that swollen when I drain her at times. This is because her body replaces fat with fluid, so she doesn't change that much in size. This happened to a hen I had previously with ascites, and when she passed I did an necropsy, and discovered that she was actually swollen, you just couldn't tell because she was underweight. I know that sounds really terrible, but it may be helpful she starts having symptoms of ascites. Hope this was helpful. Keep us updated ok? Ps: the thing that seems to help my girl is lots of fruits and veggies, fresh air and exercise. You can also give her some electrolytes and probiotic. Sorry I couldn't be of more help.