You are doing a great job! Threads like this are so helpful for educating and preparing others for what to do in this kind of situation. I hope she pulls through. Her eyes look bright and wide open, which is a good sign. And her comb is a nice color.
Dunno what to make of that nasty poo. I am no expert on what blood in a chicken's poop looks like, that almost looks too brown to be blood? But maybe it's dried blood? Hopefully someone will chime in with what should be done. I dunno who to tag around here that has experience with this kind of injury. Maybe
@Tesumph ? Last I heard they were training to be a vet. No idea if they are still active around here or not though.
I dunno if this will be beneficial at this stage or not, but this was one of the most helpful threads I've ever read on severe wound care in chickens. It's a lot to go through, but they talk a lot about necrotic skin vs healthy skin and how to know if a wound is healing well, which might be helpful for you:
https://www.backyardchickens.com/threads/graphic-pics-wing-amputation-advise.1246736/
There's also some ideas on how to build a chicken sling and/or keep them from taking the gauze off, if that's still a struggle.