chicklover56 , I'm really sorry about your chicken. I would still be very concerned she is still egg bound or has had an egg break inside her as well as the prolapse. If egg peritonitis occurs her chances are slim and she would need a treatment of Baytril to cure her. It is very expensive and is restricted in use. Only a vet can make a decision to use it since it is not tested for the use in chickens. The prolapse would have occurred from her trying to get the egg out. Take the steps to put the prolapse back in, but unless that egg is out there is not much hope for her. She may have just been slightly deformed to begin with which caused the problem. Since your birds are at the laying point be sure you are giving them layer feed. The gleet you witnessed was obviously a result of what is going on inside.
I personally never give up on a chicken as long as they still have the will to live.
Dani4Hedges, that could simply be cecal poop and maybe not a concern at all. Chickens empty their cecals usually at least once a day as they get older. It really stinks and it is dark brown normally and runny. It's all part of the bird world....not exclusive to chickens.
As a precaution, I would give them some probioitics and or vitamins in their water for a few days and see if that helps. Have you changed their diet and given them fresh veggies or feed for older chicks? If so, be sure to keep the grit going. Sometimes introduction to new foods will cause diarrhea. It just takes a while for their systems to adjust to the different levels of protein and nutrients. I've found that meal worms or other high protein foods will cause diarrhea in my birds. Sunflower seeds and other higher protein snacks can do the same.
It won't really hurt them...it's just a matter of inconvenience for you if they are cooped up.
As long as you aren't seeing blood and they are acting normal and not lethargic, I wouldn't really worry too much. Just adjust accordingly. i.e. if you are giving them new foods, do so gradually and let their systems get used to it.
Yesterday was a bust. I got so very little done. Some days I swear the I get in slow motion and get absolutely nothing done.