I had a full on post lambing prolapse last year ( MUCH more than 3" popping out, had to carefully wash and return her entire insides (seemed like) 3 times !) . Ended up leaving her In a webbing harness (no spoon) for a few months, but it meant she reared her lamb and I was able to take her to cull ewe market. ( friend nearby took similar to vet and they pts!) I used long acting ab and that seemed to do the trick. Good luck, I don't know how long it needs holding in, but I tried twice too early ( after about. 1 and 2/3 weeks), suppose it may depend how bad it is? Good luck xx