It could be a buildup of fluid under the skin, trapped and unable to drain. The fluid might be simply serous fluid or blood---very hard to say what it is. This could account for the firmness you feel. I am not sure about the color of her skin---could be bruising.
I don't know whether the dark area you are seeing is a scab or eschar (dead patch that forms over an ischemic area). That yellow area next to the dark area---is that drainage or is it firm? If it is firm it may be exposed fat.
I would keep doing what you are doing and monitor for now. If there is truly an infection it may be more obvious a bit later.
If you can I would clip the feathers that are hanging in the open wound---they will act as a wick for bacteria.
How is she doing otherwise? Eating, pooping?
I know the risk for infection is still quite high with her large lacerations so I'm going to continue the injections, cleaning 2x a day, and neosporin. Hoping she continues to improve. We let her have some social time with her only sister today. Hopefully it keeps her mood up and them bonded. I wouldn't want them to forget each other. Gretchen already has some feather growth back surprisingly (tiny follicles) and her long hackles cover up majority of the lacerations. Mable seemed happy to see her again and didn't notice her wound so there was no pecking during the supervised encounter.
What do I need to do now? I am cleaning 2x a day, the penicillin injections, and coating in neosporin 2x a day after the cleanings.
