MrsBrooke is right, you're doing a great job. Have you tried an epsom salt soak? I had a hen with a severe prolapse and would soak her and put honey on it. Like yours it didn't go in easily and I ended up going to a vet. They put in a few stitches to hold it in place and allow her to go to the bathroom. Is she still pooping? Or is the prolapse blocking her a bit? If at all possible you may want to consider going to an avian vet to see if they can stitch it in and check if she needs an antibiotic. But I understand if that's just not possible.