Lol! I have parrots and do have two little diapers for two of the conures, that I never use because they hate them. I did put one on a baby chick so i could have it on the couch without any accidents, and the chick refused to walk and just laid there looking ticked off. It was pretty funny...
Definitely seems to be a hernia, since you can push it into place. I think she would live normally, just gotta be careful because her organs can be damaged more easily, and I have no idea how she would do when she reached laying age (if it's a she).
Maybe you could try to wrap/tape her up in a...