I gotta agree with Knobbys totally on this one. 2 inches of intestinal tract to even an adult dragon is like 10-15 inches of ours coming out. Imagine that. And they didn't say that it's back in AHBD, they said "It's shrunken quite a bit", meaning that there is still a good bit on the poor dragon's intestinal tract still hanging out of it's vent. And Knobby's is correct, you absolutely cannot just push it back inside the vent, as the blood supply can easily be blocked off and obviously that will kill the intestines very quickly, that is the intestines that isn't already becoming necrotic from hanging out of the vent.
I read your post AHBD and I figured you didn't catch what they actually said, as the entire intestinal tract has not retracted back inside the dragon at all, it's still exposed. There's no way that I can think of to successfully get 2" of intestinal tract back inside the vent, let alone without causing huge blood and oxygen supply issues. This must be horribly agonizing for that dragon, that's the first priority here, can you imagine how badly that must hurt internally, to have fecal matter moving through your bowels and at the same time have the bowel not only be pulled outside your body, but then be messed with, moved around, and shoved back inside you all willy-nilly? That's just awful.
And I have absolutely no idea what they mean by "a black dart" either, I have no understanding of how this actually happened in the first place, as to actually pull 2" of a dragon's intestinal tract out through the vent is not a "prolapse", that's a mechanical disembowelment, seriously. How in the world did this happen? And what do you mean by a "black dart" was hanging out of her vent?