Hi sp435, welcome here! Good luck in your research, just out of curiosity where do you study/conduct it?
Are you a vet/vet nurse? If not, you could try and speak to them as they will have lots of experience - I'm not saying farmers/crofters/smallholders haven't (far from me!!), but it's just that a vet tends to see many more cases in one season than a breeder.
Having said that, I haven't thoroughly researched the topic myself but I remember during vet school and later in practice we were told that if a ewe prolapses it's not a good idea to keep her and lamb her again as she will tend to have the same problem again - and very likely to transmit the characteristic to every lamb she has.
We were told that the mother ewe should be culled and lambs not kept as breeders; daughters especially but tups too (as they transmit conformation as well), just fatten them up and eat them.
Very different from a cow. If a cow has a prolapse it's generally ok to calve her again, as after the prolapse has been reduced there will be formation of basically scar tissue and internal attachments between organs in the abdomen that will keep the uterus in place; however, I still wouldn't advise to keep her progeny as breeding stock.
Good luck!