What happened to her tail feathers?

[Okaythen]

Recently my smallest chicken rattlesnake has been very vocal. I thought she might have wanted to lay an egg but even at night, when I fill up the food and water, she begins to sort of squawk. (I say squawk but it’s really just her “speaking”) I don’t know what it could be because all of my other girls are fine. I have however added a new hen to the flock, but she is the lowest in the pecking triangle (Their pecking order got messed up when rattlesnake hatched eggs and I separated them). I’m new to raising chickens and haven’t ever seen my other girls tail feathers been, I’m assuming, ripped out before. I held her for a bit and she’s been calm, but won’t leave my side.