My easter egger, Helga. She is a year old. Has a swollen abdomen. I came home from work last Wednesday to find one of my hens dead in the yard with no injury and had not been showing any signs of illness. I decided to check everyone out to see if something was going on with the rest of them when I noticed Helga hunkered down with a drooping tail. When I picked her up I immediately noticed her swollen belly. It is between her vent and her legs. I took her inside and bathed her and let her sleep indoors overnight. During the bath I did probe her to check for an egg and I didn't think I felt anything but it was the first time I had done this. I'm new at chicken keeping. Anyway, she was pooping fine, and in the morning there was a thin shelled egg in her box.
The swelling seemed squishy when I first noticed it but now it feels to me like it has firmed up. She is waddling where she used to be quite quick. I went ahead and made an appointment with my vet for a couple days from now.
Any thoughts on what this could be? and what if anything I can do to help her out until I can get her to her vet appointment on Wednesday? My inexperience and google seems to indicate ascites but why? Is it normal for such a young hen to get this ill?
The swelling seemed squishy when I first noticed it but now it feels to me like it has firmed up. She is waddling where she used to be quite quick. I went ahead and made an appointment with my vet for a couple days from now.
Any thoughts on what this could be? and what if anything I can do to help her out until I can get her to her vet appointment on Wednesday? My inexperience and google seems to indicate ascites but why? Is it normal for such a young hen to get this ill?
From what you have described I think this is the likely reason she is sick. Have I given her(and perhaps others) a death sentence?

That means I will be treating 19 chickens for lice, I have two other hens with fluid in the abdomens that I know of, and some ongoing respiratory issues that he believes is environmental. He said that when Helga stops eating then we should put her down and that time will probably be within a month.