Thank you all so much again. She does seem to have a prominent breast bone, and has been doing a lot of laying down and she is sleeping laying down. I will keep an eye on it regardless, and hit it with treatments as well.
Her crate is not that big. She can stand comfortably with plenty of extra headroom, turn around and move a few steps, but she's still pretty confined. Bedding is straw, that I am changing frequently (we found a few live maggots at the bottom of the crate early on when we changed it the first time, so being very diligent about full clean outs a couple times a day). She seems to be in great shape considering everything again this morning, standing pretty normally, greedily ate up some arugula leaves, chopped apple and feed the minute I put it in her crate, and vocalizing at me. Her color looks great. I feel like i need to give her some walk about time supervised in the garage (not an ideal space for that, and a little concerned about stressing her when I have to grab her again to put her back) and/ or improvise a larger crate. I really wasn't expecting her to have much time left when I first saw the wound, or at least not be in a state to be needing to move around more normally. It is crazy what they can endure, and even before this I'd guess she's probably my top one or two hens on the toughness scale. I swear if I let her out she'd join the flock and act like nothing was wrong (don't worry, definitely not going to be doing that).
The antibiotic ointment had been on my list, but I managed to forget about that one with everything else. I will start with that immediately today. Her wound did look dry (now that its cleaner) last night when I applied the pyrethrin and veterycin. I used a syringe to get both of those gently under the skin around the margins, prior to that I had been filling the wound and tilting her to let it run under. Really, really hoping today will be the end for the maggots (was hoping that was yesterday too tho).
It was sunny and really warm yesterday and the day before, so I wrapped her crate in some fine mesh netting to protect against flies and brought her outside for a flock mate visit and some sunshine. They came to check her out, and I fed them some scratch, and she ate her feed while they were eating. Maybe a silly projection (because it definitely did for me) but this seemed to have boosted her morale quite a bit.