What antibiotics do you have and is she still eating and drinking enough? If you have a kitchen scale, you should probably weigh her every few days. The feed store I go to had a peahen that started off looking like your hen. After a couple of weeks the pus mass was so large that she couldn't eat right, so of course she lost tons of weight. She got to the point where she looked like she was going to die, so I offered to "fix" her. It took a few days, but I finally got all of the pus out. While treating her, I was giving her Baytril 15mg/kg by mouth, once a day. I was also tube feeding her baby bird food mixed with Pedialyte since she was not eating.