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Is that on the back of her neck?
It could be her crop. I don't know chicken anatomy very well, but I've seen weird bumps on my chicks, and it went away.
I think it's a hematoma, which is a fluid filled (or blood filled bump) from when she got pecked. I think maybe it'll just go away. I would keep an eye on it, and if it seems to get worse, you could drain the fluid from it.