Oh my goodness!!!! It is absolutely amazing to me that she recovered from that at all, much less with no lifeflight so the nearest trauma center and an ICU stay!
That injury is pretty horrifying. You must've taken great care of her, and I really appreciate you posting that to show their resilience. It certainly gives me more confidence that Buttercup will do just fine without stitches as long as we keep her clean and quiet. I'm not going to ask what happened to your overzealous rooster after that event....
Buttercup seems to be resting comfortably in her cat carrier in the basement. It is very warm down there because our ductwork must be leaky, probably 80 degrees--hopefully that won't be a problem for her transitioning back outside in a few days. I do have one of those flat panel heaters in the coop for the coldest days--I can always turn that on and put her in isolation next to it. I can't tell if she ate or drank, but she is moving around (spilled a lot of the water, in fact), and had another big stinky poop that looked normal, so I take that as a good sign.I'll move a big dog crate or pen down there for her in the morning so she can get up and stretch her legs a bit more than the cat carrier allows.
If you see her panting with beak slightly open or resting with her wings spread away from her sides a bit she is possibly too warm. If you see that you may need to move her to another area.