Here's hoping for the best! It could get better. I had a hen prolapse (but not nearly as badly) and I found her with her egg broken and her oviduct sticking out. I got to her before anyone could peck at it, and she is a Serama, so it's always been hard for her to reach back to her vent. I did what most everyone here is suggesting and what you have done, and within a day, it had shrunk somewhat, and then a little more the second day, and by day three it had receded completely. I don't want to give you false hope because it sounds much worse than Iliya's case ever was, but it could happen. It doesn't sound good that it hasn't receded at all.
Interestingly enough, Iilya was also the chick with a terrible case of always getting poo stuck to her butt.