I'm just seeing the newer video of her.
The coloring of her face/skin is off.
Have you ever had respiratory infection within your flock?
Could be she's getting something hung in the throat or she's recovering from bruising/internal injuries. But it's been month before this symptom showed up. I would say that you should have seen it right after the attack and as she healed, it would have gotten better/resolved by now, instead of suddenly appearing in the last 2-3days.
Have you gotten more birds (newbies) to replace the ones you lost by any chance?
What's her poop like?
I'd consider giving her a round of Tylosin to see if that helps. Not sure why she's that color. It could be liver dysfunction and not related to the noise/difficulty that she's having now. So hard to know...so many things can affect poultry.
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