Everything is looking good. Honestly, if you wanted to save your supplies, based on the pictures, mother nature will take care of the rest. You have intact skin beds at varying stages of growth. It does not hurt to keep going with it though. I would start looking towards protection and...
Granulation tissue. Congratulations. After a good final cleanout I would recommend not pulling duchess's skin flap back again. This will allow the living tissue to reattach and hopefully seal itself off reducing infection risk and decreasing healing time. I am really interested to see how...
That yellow tissue may very well be a fatty layer also. Keep cleaning it and applying a barrier with clean cover and her body will do the rest. It's a nasty wound, but easily survivable for sure.
Once a day for cleaning/irrigation is optimal. But as mentioned: regeneration occurs better in a "moist" environment. Not saturated, and not dried. After daily cleaning I would only apply your choice of "moisturizer" as needed for the rest of the day to keep it from drying out.
I only use...
I think I can see a good chunk of muscle and skin left which will be your regeneration point. All the other black crusty stuff is likely dried blood, skin, etc. Remember lots of microvasculature was ripped away as well. I don't know if chickens have a lymph node system but those "cysts" may...
Your "cysts" are entirely possibly hematomas from ripped blood vessels. They should eventually reabsorb as the body heals and processes everything. Are you seeing any skin regrowth back towards the nub yet in any way? She looks FANTASTIC from that previous picture. The wound itself will be...
I can't tell from the last picture, did you remove the arm completely from the shoulder joint? I am not a surgeon, but when amputating, they typically cut but leave a flap of skin where the skin can be sewn back around the remaining stump. Any exposed bone will likely incur a bone infection...