Whooaaa now, slow your roll there...No she is not being PECKED. Yes she is separated with the other chick
It was just a question being asked, no need to get all bent out of shape.
If you wish, take a clear, well lit photo of the bump and post it that would be great.
It's not uncommon for a chick to have a pecking wound like that.
If it's getting bigger, apply a thin layer of triple antibiotic ointment on it and stop rubbing and messing with it.