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Do you mean "comb"? "Crown" would normally refer to the head.
I don't see any problem with her comb. But if you see any fresh injuries to it, dab a bit of Blu-kote on it with a Q-tip. That will heal it and also camouflage it so others don't keep pecking it.
Comb injuries are as common to chickens as skinned knees are in grade-school kids. The comb is where rival chickens grab each other when having a tiff. Scabby combs appear often on chickens.