Small update. I know this sounds futile but I am going to try everything that doesn't harm her to see if we can solve this.
The Vet had put a long term stitch through the abdominal wall into the colon to try and develop scar tissue and hold back the tissue from prolapsing. We are going this Thursday to have him reposition a new stitch closer to what we believe is the point of weakness in the cloaca in hopes of better retaining in the tissue when she defecates (urates are not causing her prolapse we have found). This may or may not work but as the current stitch did retard a small amount of prolapsed tissue from coming out, there is a chance, even if slight, that the new stitch will be in the right portion of the cloaca and will help build up scar tissue while preventing too much tissue from falling out that she can't retract herself.
I am also going to go over prey size and possibly up to hopper mice for the calcium load. There is research that calcium deficiency prevents the muscles of the abdomen and cloaca from being able to retract. This research was done on birds, frogs, and chameleons but the theory is sound with snakes as well. While I would never supplement calcium to a snake due to the damage it can cause on the kidneys, larger prey have more developed bones which supplement calcium in their diets (snakes are not able to synthesize and absorb calcium powder like lizards can instead it is completely voided during defecation).
It has also been determined that prey size is not a determining factor in causing prolapses and that was a myth perpetuated by misinformed breeders and keepers who did not comprehend the underlying factors of snake prolapse and their inability to test snakes for disease and deficiency and simply assumed diet was the sole contributing factor (it is not).
While diet restrictions after a prolapse are key (she is not restricted until the next defecation cycle), prey size is irrelevant in prolapse cause.
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