Egg Bound with resulting prolapse--when to Cull?

I have a hen who became severely egg bound while I was out on Vacation last weekend. My house sitter was able to get the egg out intact (Friday eve), but my hen's behind is quite a mess.
I came home on Sunday and helped her pass another egg (intact). I cleaned her up by soaking her behind as best I could. She had dried yolk and poop stuck to her vent/tissue, and she had a major prolapse with bleeding and what I would describe as hemorrhoids.
I'm keeping her in a cage in a dark area with oyster shell and water to stop her from laying, but she is still prolapsed, even though I have pushed everything inside, and applied Preparation H (web site recommended for prolapse in chickens).
My question is--can she recover from this, or do I need to cull her?

 

I've only given her Oyster shell and water for the last couple days to keep her from laying. Her prolapse is severe. Although I have been treating it with Preparation H and Vetericyn every day, this huge portion of flesh keeps hanging out of her behind. I push it in, and it pops back out. It is the size of a large walnut.

I can try to post a picture later when my boyfriend can help me. She is not showing any signs of improvement, other than feeling better.

I think I may butcher her this weekend.

 

I didn't mean that the Oyster shell was to stop her from laying. My research online said that they need the Oyster shell during a prolapse to help encourage the muscle to regain strength. Apparently lack of Calcium can cause muscle weakness when laying.

It also stated to stop giving food for a couple days and keep in a dark environment to discourage laying in an attempt to let the tissue shrink back to normal.

My hens receive a high quality layer feed with Calcium, as well as access to oyster shell at all times.

If I wrap her bottom, how will she poop? I'll try to get a picture tonight after I clean her off.